Group replica wal segments by index

This commit changes the replica path format to group segments within a single index in the same directory. This is to eventually add the ability to seek to a record on file-based systems without having to iterate over the records. The DB shadow WAL will also be changed to this same format to support live replicas.
2021-06-12 10:20:22 -06:00
27 changed files with 1458 additions and 1128 deletions
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -1,18 +1,17 @@
-## Contribution Policy
+## Open-source, not open-contribution

-Initially, Litestream was closed to outside contributions. The goal was to
-reduce burnout by limiting the maintenance overhead of reviewing and validating
-third-party code. However, this policy is overly broad and has prevented small,
-easily testable patches from being contributed.
+[Similar to SQLite](https://www.sqlite.org/copyright.html), Litestream is open
+source but closed to contributions. This keeps the code base free of proprietary
+or licensed code but it also helps me continue to maintain and build Litestream.

-Litestream is now open to code contributions for bug fixes only. Features carry
-a long-term maintenance burden so they will not be accepted at this time.
-Please [submit an issue][new-issue] if you have a feature you'd like to
-request.
-
-If you find mistakes in the documentation, please submit a fix to the
-[documentation repository][docs].
-
-[new-issue]: https://github.com/benbjohnson/litestream/issues/new
-[docs]: https://github.com/benbjohnson/litestream.io
+As the author of [BoltDB](https://github.com/boltdb/bolt), I found that
+accepting and maintaining third party patches contributed to my burn out and
+I eventually archived the project. Writing databases & low-level replication
+tools involves nuance and simple one line changes can have profound and
+unexpected changes in correctness and performance. Small contributions
+typically required hours of my time to properly test and validate them.

+I am grateful for community involvement, bug reports, & feature requests. I do
+not wish to come off as anything but welcoming, however, I've
+made the decision to keep this project closed to contributions for my own
+mental health and long term viability of the project.
--- a/.github/pull_request_template.md
+++ b/.github/pull_request_template.md
@@ -0,0 +1,7 @@
+Litestream is not accepting code contributions at this time. You can find a summary of why on the project's GitHub README:
+
+https://github.com/benbjohnson/litestream#open-source-not-open-contribution
+
+Web site & Documentation changes, however, are welcome. You can find that repository here:
+
+https://github.com/benbjohnson/litestream.io
--- a/.github/workflows/commit.yml
+++ b/.github/workflows/commit.yml
@@ -1,121 +0,0 @@
-on: push
-
-jobs:
-  build:
-    name: Build & Unit Test
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-go@v2
-        with:
-          go-version: '1.20'
-      - uses: actions/cache@v2
-        with:
-          path: ~/go/pkg/mod
-          key: ${{ inputs.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: ${{ inputs.os }}-go-
-
-      - run: go env
-
-      - run: go install ./cmd/litestream
-
-      - run: go test -v ./...
-
-#      - name: Build integration test
-#        run: go test -c ./integration
-#
-#      - uses: actions/upload-artifact@v2
-#        with:
-#          name: integration.test
-#          path: integration.test
-#          if-no-files-found: error
-
-#  long-running-test:
-#    name: Run Long Running Unit Test
-#    runs-on: ubuntu-latest
-#    steps:
-#      - uses: actions/checkout@v2
-#      - uses: actions/setup-go@v2
-#        with: 
-#          go-version: '1.20'
-#      - uses: actions/cache@v2
-#        with:
-#          path: ~/go/pkg/mod
-#          key: ${{ inputs.os }}-go-${{ hashFiles('**/go.sum') }}
-#          restore-keys: ${{ inputs.os }}-go-
-#
-#      - run: go install ./cmd/litestream
-#      - run: go test -v -run=TestCmd_Replicate_LongRunning ./integration -long-running-duration 1m
-
-#  s3-integration-test:
-#    name: Run S3 Integration Tests
-#    runs-on: ubuntu-latest
-#    needs: build
-#    steps:
-#      - uses: actions/download-artifact@v2
-#        with:
-#          name: integration.test
-#      - run: chmod +x integration.test
-#
-#      - run: ./integration.test -test.v -test.run=TestReplicaClient -replica-type s3
-#        env:
-#          LITESTREAM_S3_ACCESS_KEY_ID: ${{ secrets.LITESTREAM_S3_ACCESS_KEY_ID }}
-#          LITESTREAM_S3_SECRET_ACCESS_KEY: ${{ secrets.LITESTREAM_S3_SECRET_ACCESS_KEY }}
-#          LITESTREAM_S3_REGION: us-east-1
-#          LITESTREAM_S3_BUCKET: integration.litestream.io
-
-#  gcp-integration-test:
-#    name: Run GCP Integration Tests
-#    runs-on: ubuntu-latest
-#    needs: build
-#    steps:
-#      - name: Extract GCP credentials
-#        run: 'echo "$GOOGLE_APPLICATION_CREDENTIALS" > /opt/gcp.json'
-#        shell: bash
-#        env:
-#          GOOGLE_APPLICATION_CREDENTIALS: ${{secrets.GOOGLE_APPLICATION_CREDENTIALS}}
-#
-#      - uses: actions/download-artifact@v2
-#        with:
-#          name: integration.test
-#      - run: chmod +x integration.test
-#
-#      - run: ./integration.test -test.v -test.run=TestReplicaClient -replica-type gcs
-#        env:
-#          GOOGLE_APPLICATION_CREDENTIALS:  /opt/gcp.json
-#          LITESTREAM_GCS_BUCKET:           integration.litestream.io
-
-#  abs-integration-test:
-#    name: Run Azure Blob Store Integration Tests
-#    runs-on: ubuntu-latest
-#    needs: build
-#    steps:
-#      - uses: actions/download-artifact@v2
-#        with:
-#          name: integration.test
-#      - run: chmod +x integration.test
-#
-#      - run: ./integration.test -test.v -test.run=TestReplicaClient -replica-type abs
-#        env:
-#          LITESTREAM_ABS_ACCOUNT_NAME:     ${{ secrets.LITESTREAM_ABS_ACCOUNT_NAME }}
-#          LITESTREAM_ABS_ACCOUNT_KEY:      ${{ secrets.LITESTREAM_ABS_ACCOUNT_KEY }}
-#          LITESTREAM_ABS_BUCKET:           integration
-
-#  sftp-integration-test:
-#    name: Run SFTP Integration Tests
-#    runs-on: ubuntu-latest
-#    needs: build
-#    steps:
-#      - name: Extract SSH key
-#        run: 'echo "$LITESTREAM_SFTP_KEY" > /opt/id_ed25519'
-#        shell: bash
-#        env:
-#          LITESTREAM_SFTP_KEY: ${{secrets.LITESTREAM_SFTP_KEY}}
-#
-#      - name: Run sftp tests
-#        run: go test -v -run=TestReplicaClient ./integration -replica-type sftp
-#        env:
-#          LITESTREAM_SFTP_HOST:     ${{ secrets.LITESTREAM_SFTP_HOST }}
-#          LITESTREAM_SFTP_USER:     ${{ secrets.LITESTREAM_SFTP_USER }}
-#          LITESTREAM_SFTP_KEY_PATH: /opt/id_ed25519
-#          LITESTREAM_SFTP_PATH:     ${{ secrets.LITESTREAM_SFTP_PATH }}
--- a/.github/workflows/release.docker.yml
+++ b/.github/workflows/release.docker.yml
@@ -1,51 +0,0 @@
-on:
-  release:
-    types:
-      - published
-  pull_request:
-    types:
-      - opened
-      - synchronize
-      - reopened
-    branches-ignore:
-      - "dependabot/**"
-
-name: Release (Docker)
-jobs:
-  docker:
-    runs-on: ubuntu-latest
-    env:
-      PLATFORMS: "linux/amd64,linux/arm64"
-      VERSION: "${{ github.event_name == 'release' && github.event.release.name || github.sha }}"
-
-    steps:
-      - uses: actions/checkout@v2
-      - uses: docker/setup-qemu-action@v1
-      - uses: docker/setup-buildx-action@v1
-
-      - uses: docker/login-action@v1
-        with:
-          username: benbjohnson
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-      
-      - id: meta
-        uses: docker/metadata-action@v3
-        with:
-          images: litestream/litestream
-          tags: |
-            type=ref,event=branch
-            type=ref,event=pr
-            type=sha
-            type=sha,format=long
-            type=semver,pattern={{version}}
-            type=semver,pattern={{major}}.{{minor}}
-      
-      - uses: docker/build-push-action@v2
-        with:
-          context: .
-          push: true
-          platforms: ${{ env.PLATFORMS }}
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
-          build-args: |
-            LITESTREAM_VERSION=${{ env.VERSION }}
--- a/.github/workflows/release.linux.yml
+++ b/.github/workflows/release.linux.yml
@@ -6,7 +6,7 @@ on:
 name: release (linux)
 jobs:
  build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
    strategy:
      matrix:
        include:
@@ -31,7 +31,7 @@ jobs:
      - uses: actions/checkout@v2
      - uses: actions/setup-go@v2
        with:
-          go-version: '1.20'
+          go-version: '1.16'

      - id: release
        uses: bruceadams/get-release@v1.2.2
@@ -54,7 +54,7 @@ jobs:
          mkdir -p dist
          cp etc/litestream.yml etc/litestream.service dist
          cat etc/nfpm.yml | LITESTREAM_VERSION=${{ steps.release.outputs.tag_name }} envsubst > dist/nfpm.yml
-          CGO_ENABLED=1 go build -ldflags "-s -w -extldflags "-static" -X 'main.Version=${{ steps.release.outputs.tag_name }}'" -tags osusergo,netgo,sqlite_omit_load_extension -o dist/litestream ./cmd/litestream
+          CGO_ENABLED=1 go build -ldflags "-s -w -X 'main.Version=${{ steps.release.outputs.tag_name }}'" -o dist/litestream ./cmd/litestream
          
          cd dist
          tar -czvf litestream-${{ steps.release.outputs.tag_name }}-${{ env.GOOS }}-${{ env.GOARCH }}${{ env.GOARM }}.tar.gz litestream
--- a/.github/workflows/release.linux_static.yml
+++ b/.github/workflows/release.linux_static.yml
@@ -0,0 +1,62 @@
+on:
+  release:
+    types:
+      - created
+
+name: release (linux/static)
+jobs:
+  build:
+    runs-on: ubuntu-18.04
+    strategy:
+      matrix:
+        include:
+          - arch: amd64
+            cc:   gcc
+          - arch: arm64
+            cc:   aarch64-linux-gnu-gcc
+          - arch: arm
+            arm:  6
+            cc:   arm-linux-gnueabi-gcc
+          - arch: arm
+            arm:  7
+            cc:   arm-linux-gnueabihf-gcc
+
+    env:
+      GOOS:   linux
+      GOARCH: ${{ matrix.arch }}
+      GOARM:  ${{ matrix.arm }}
+      CC:     ${{ matrix.cc }}
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-go@v2
+        with:
+          go-version: '1.16'
+
+      - id: release
+        uses: bruceadams/get-release@v1.2.2
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+
+      - name: Install cross-compilers
+        run: |
+          sudo apt-get update 
+          sudo apt-get install -y gcc-aarch64-linux-gnu gcc-arm-linux-gnueabihf gcc-arm-linux-gnueabi
+
+      - name: Build litestream
+        run: |
+          rm -rf dist
+          mkdir -p dist
+          CGO_ENABLED=1 go build -ldflags "-s -w -extldflags "-static" -X 'main.Version=${{ steps.release.outputs.tag_name }}'" -tags osusergo,netgo,sqlite_omit_load_extension -o dist/litestream ./cmd/litestream
+          cd dist
+          tar -czvf litestream-${{ steps.release.outputs.tag_name }}-${{ env.GOOS }}-${{ env.GOARCH }}${{ env.GOARM }}-static.tar.gz litestream
+
+      - name: Upload release tarball
+        uses: actions/upload-release-asset@v1.0.2
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        with:
+          upload_url: ${{ steps.release.outputs.upload_url }}
+          asset_path: ./dist/litestream-${{ steps.release.outputs.tag_name }}-${{ env.GOOS }}-${{ env.GOARCH }}${{ env.GOARM }}-static.tar.gz
+          asset_name: litestream-${{ steps.release.outputs.tag_name }}-${{ env.GOOS }}-${{ env.GOARCH }}${{ env.GOARM }}-static.tar.gz
+          asset_content_type: application/gzip
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -0,0 +1,62 @@
+on: push
+name: test
+jobs:
+  test:
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/setup-go@v2
+        with:
+          go-version: '1.16'
+
+      - uses: actions/checkout@v2
+
+      - uses: actions/cache@v2
+        with:
+          path: ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+
+      - name: Extract GCP credentials
+        run: 'echo "$GOOGLE_APPLICATION_CREDENTIALS" > /opt/gcp.json'
+        shell: bash
+        env:
+          GOOGLE_APPLICATION_CREDENTIALS: ${{secrets.GOOGLE_APPLICATION_CREDENTIALS}}
+
+      - name: Extract SSH key
+        run: 'echo "$LITESTREAM_SFTP_KEY" > /opt/id_ed25519'
+        shell: bash
+        env:
+          LITESTREAM_SFTP_KEY: ${{secrets.LITESTREAM_SFTP_KEY}}
+
+      - name: Run unit tests
+        run: go test -v ./...
+
+      - name: Run aws s3 tests
+        run: go test -v -run=TestReplicaClient . -integration s3
+        env:
+          LITESTREAM_S3_ACCESS_KEY_ID:     ${{ secrets.LITESTREAM_S3_ACCESS_KEY_ID }}
+          LITESTREAM_S3_SECRET_ACCESS_KEY: ${{ secrets.LITESTREAM_S3_SECRET_ACCESS_KEY }}
+          LITESTREAM_S3_REGION:            ${{ secrets.LITESTREAM_S3_REGION }}
+          LITESTREAM_S3_BUCKET:            ${{ secrets.LITESTREAM_S3_BUCKET }}
+
+      - name: Run google cloud storage (gcs) tests
+        run: go test -v -run=TestReplicaClient . -integration gcs
+        env:
+          GOOGLE_APPLICATION_CREDENTIALS:  /opt/gcp.json
+          LITESTREAM_GCS_BUCKET:           ${{ secrets.LITESTREAM_GCS_BUCKET }}
+
+      - name: Run azure blob storage (abs) tests
+        run: go test -v -run=TestReplicaClient . -integration abs
+        env:
+          LITESTREAM_ABS_ACCOUNT_NAME:     ${{ secrets.LITESTREAM_ABS_ACCOUNT_NAME }}
+          LITESTREAM_ABS_ACCOUNT_KEY:      ${{ secrets.LITESTREAM_ABS_ACCOUNT_KEY }}
+          LITESTREAM_ABS_BUCKET:           ${{ secrets.LITESTREAM_ABS_BUCKET }}
+
+      - name: Run sftp tests
+        run: go test -v -run=TestReplicaClient . -integration sftp
+        env:
+          LITESTREAM_SFTP_HOST:     ${{ secrets.LITESTREAM_SFTP_HOST }}
+          LITESTREAM_SFTP_USER:     ${{ secrets.LITESTREAM_SFTP_USER }}
+          LITESTREAM_SFTP_KEY_PATH: /opt/id_ed25519
+          LITESTREAM_SFTP_PATH:     ${{ secrets.LITESTREAM_SFTP_PATH }}
--- a/8
+++ b/8
@@ -1,16 +1,12 @@
-FROM golang:1.20.1 as builder
-
+FROM golang:1.16 as builder
 WORKDIR /src/litestream
 COPY . .
-
 ARG LITESTREAM_VERSION=latest
-
 RUN --mount=type=cache,target=/root/.cache/go-build \
 	--mount=type=cache,target=/go/pkg \
 	go build -ldflags "-s -w -X 'main.Version=${LITESTREAM_VERSION}' -extldflags '-static'" -tags osusergo,netgo,sqlite_omit_load_extension -o /usr/local/bin/litestream ./cmd/litestream

-
-FROM alpine:3.17.2
+FROM alpine
 COPY --from=builder /usr/local/bin/litestream /usr/local/bin/litestream
 ENTRYPOINT ["/usr/local/bin/litestream"]
 CMD []
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ Litestream
 ![test](https://github.com/benbjohnson/litestream/workflows/test/badge.svg)
 ==========

-Litestream is a standalone disaster recovery tool for SQLite. It runs as a
+Litestream is a standalone streaming replication tool for SQLite. It runs as a
 background process and safely replicates changes incrementally to another file
 or S3. Litestream only communicates with SQLite through the SQLite API so it
 will not corrupt your database.
@@ -33,29 +33,35 @@ energy into the project to help make it better:

 - Thanks to [Cory LaNou](https://twitter.com/corylanou) for giving early feedback and testing when Litestream was still pre-release.
 - Thanks to [Michael Lynch](https://github.com/mtlynch) for digging into issues and contributing to the documentation.
- Thanks to [Kurt Mackey](https://twitter.com/mrkurt) for feedback and testing.
+- Thanks to [Kurt Mackey](https://twitter.com/mrkurt) for feedback and testing. Also, thanks to fly.io for providing testing resources.
 - Thanks to [Sam Weston](https://twitter.com/cablespaghetti) for figuring out how to run Litestream on Kubernetes and writing up the docs for it.
 - Thanks to [Rafael](https://github.com/netstx) & [Jungle Boogie](https://github.com/jungle-boogie) for helping to get OpenBSD release builds working.
- Thanks to [Simon Gottschlag](https://github.com/simongottschlag), [Marin](https://github.com/supermarin),[Victor Björklund](https://github.com/victorbjorklund), [Jonathan Beri](https://twitter.com/beriberikix) [Yuri](https://github.com/yurivish), [Nathan Probst](https://github.com/nprbst), [Yann Coleu](https://github.com/yanc0), and [Nicholas Grilly](https://twitter.com/ngrilly) for frequent feedback, testing, & support.
-
-Huge thanks to fly.io for their support and for contributing credits for testing and development!
+- Thanks to [Simon Gottschlag](https://github.com/simongottschlag), [Marin](https://github.com/supermarin),[Victor Björklund](https://github.com/victorbjorklund), [Jonathan Beri](https://twitter.com/beriberikix) [Yuri](https://github.com/yurivish), [Nathan Probst](https://github.com/nprbst), [Yann Coleuu](https://github.com/yanc0), and [Nicholas Grilly](https://twitter.com/ngrilly) for frequent feedback, testing, & support.


-## Contribution Policy

-Initially, Litestream was closed to outside contributions. The goal was to
-reduce burnout by limiting the maintenance overhead of reviewing and validating
-third-party code. However, this policy is overly broad and has prevented small,
-easily testable patches from being contributed.

-Litestream is now open to code contributions for bug fixes only. Features carry
-a long-term maintenance burden so they will not be accepted at this time.
-Please [submit an issue][new-issue] if you have a feature you'd like to
-request.
+## Open-source, not open-contribution

-If you find mistakes in the documentation, please submit a fix to the
-[documentation repository][docs].
+[Similar to SQLite](https://www.sqlite.org/copyright.html), Litestream is open
+source but closed to code contributions. This keeps the code base free of
+proprietary or licensed code but it also helps me continue to maintain and build
+Litestream.

-[new-issue]: https://github.com/benbjohnson/litestream/issues/new
+As the author of [BoltDB](https://github.com/boltdb/bolt), I found that
+accepting and maintaining third party patches contributed to my burn out and
+I eventually archived the project. Writing databases & low-level replication
+tools involves nuance and simple one line changes can have profound and
+unexpected changes in correctness and performance. Small contributions
+typically required hours of my time to properly test and validate them.
+
+I am grateful for community involvement, bug reports, & feature requests. I do
+not wish to come off as anything but welcoming, however, I've
+made the decision to keep this project closed to contributions for my own
+mental health and long term viability of the project.
+
+The [documentation repository][docs] is MIT licensed and pull requests are welcome there.
+
+[releases]: https://github.com/benbjohnson/litestream/releases
 [docs]: https://github.com/benbjohnson/litestream.io

--- a/abs/replica_client.go
+++ b/abs/replica_client.go
@@ -102,7 +102,7 @@ func (c *ReplicaClient) Generations(ctx context.Context) ([]string, error) {
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()

 		resp, err := c.containerURL.ListBlobsHierarchySegment(ctx, marker, "/", azblob.ListBlobsSegmentOptions{
-			Prefix: litestream.GenerationsPath(c.Path) + "/",
+			Prefix: path.Join(c.Path, "generations") + "/",
 		})
 		if err != nil {
 			return nil, err
@@ -125,18 +125,17 @@ func (c *ReplicaClient) Generations(ctx context.Context) ([]string, error) {
 func (c *ReplicaClient) DeleteGeneration(ctx context.Context, generation string) error {
 	if err := c.Init(ctx); err != nil {
 		return err
+	} else if generation == "" {
+		return fmt.Errorf("generation required")
 	}

-	dir, err := litestream.GenerationPath(c.Path, generation)
-	if err != nil {
-		return fmt.Errorf("cannot determine generation path: %w", err)
-	}
+	prefix := path.Join(c.Path, "generations", generation) + "/"

 	var marker azblob.Marker
 	for marker.NotDone() {
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()

-		resp, err := c.containerURL.ListBlobsFlatSegment(ctx, marker, azblob.ListBlobsSegmentOptions{Prefix: dir + "/"})
+		resp, err := c.containerURL.ListBlobsFlatSegment(ctx, marker, azblob.ListBlobsSegmentOptions{Prefix: prefix})
 		if err != nil {
 			return err
 		}
@@ -171,12 +170,11 @@ func (c *ReplicaClient) Snapshots(ctx context.Context, generation string) (lites
 func (c *ReplicaClient) WriteSnapshot(ctx context.Context, generation string, index int, rd io.Reader) (info litestream.SnapshotInfo, err error) {
 	if err := c.Init(ctx); err != nil {
 		return info, err
+	} else if generation == "" {
+		return info, fmt.Errorf("generation required")
 	}

-	key, err := litestream.SnapshotPath(c.Path, generation, index)
-	if err != nil {
-		return info, fmt.Errorf("cannot determine snapshot path: %w", err)
-	}
+	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")
 	startTime := time.Now()

 	rc := internal.NewReadCounter(rd)
@@ -206,12 +204,11 @@ func (c *ReplicaClient) WriteSnapshot(ctx context.Context, generation string, in
 func (c *ReplicaClient) SnapshotReader(ctx context.Context, generation string, index int) (io.ReadCloser, error) {
 	if err := c.Init(ctx); err != nil {
 		return nil, err
+	} else if generation == "" {
+		return nil, fmt.Errorf("generation required")
 	}

-	key, err := litestream.SnapshotPath(c.Path, generation, index)
-	if err != nil {
-		return nil, fmt.Errorf("cannot determine snapshot path: %w", err)
-	}
+	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")

 	blobURL := c.containerURL.NewBlobURL(key)
 	resp, err := blobURL.Download(ctx, 0, 0, azblob.BlobAccessConditions{}, false, azblob.ClientProvidedKeyOptions{})
@@ -231,12 +228,11 @@ func (c *ReplicaClient) SnapshotReader(ctx context.Context, generation string, i
 func (c *ReplicaClient) DeleteSnapshot(ctx context.Context, generation string, index int) error {
 	if err := c.Init(ctx); err != nil {
 		return err
+	} else if generation == "" {
+		return fmt.Errorf("generation required")
 	}

-	key, err := litestream.SnapshotPath(c.Path, generation, index)
-	if err != nil {
-		return fmt.Errorf("cannot determine snapshot path: %w", err)
-	}
+	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")

 	internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "DELETE").Inc()

@@ -261,12 +257,11 @@ func (c *ReplicaClient) WALSegments(ctx context.Context, generation string) (lit
 func (c *ReplicaClient) WriteWALSegment(ctx context.Context, pos litestream.Pos, rd io.Reader) (info litestream.WALSegmentInfo, err error) {
 	if err := c.Init(ctx); err != nil {
 		return info, err
+	} else if pos.Generation == "" {
+		return info, fmt.Errorf("generation required")
 	}

-	key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
-	if err != nil {
-		return info, fmt.Errorf("cannot determine wal segment path: %w", err)
-	}
+	key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
 	startTime := time.Now()

 	rc := internal.NewReadCounter(rd)
@@ -296,12 +291,11 @@ func (c *ReplicaClient) WriteWALSegment(ctx context.Context, pos litestream.Pos,
 func (c *ReplicaClient) WALSegmentReader(ctx context.Context, pos litestream.Pos) (io.ReadCloser, error) {
 	if err := c.Init(ctx); err != nil {
 		return nil, err
+	} else if pos.Generation == "" {
+		return nil, fmt.Errorf("generation required")
 	}

-	key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
-	if err != nil {
-		return nil, fmt.Errorf("cannot determine wal segment path: %w", err)
-	}
+	key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")

 	blobURL := c.containerURL.NewBlobURL(key)
 	resp, err := blobURL.Download(ctx, 0, 0, azblob.BlobAccessConditions{}, false, azblob.ClientProvidedKeyOptions{})
@@ -324,11 +318,12 @@ func (c *ReplicaClient) DeleteWALSegments(ctx context.Context, a []litestream.Po
 	}

 	for _, pos := range a {
-		key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
-		if err != nil {
-			return fmt.Errorf("cannot determine wal segment path: %w", err)
+		if pos.Generation == "" {
+			return fmt.Errorf("generation required")
 		}

+		key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
+
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "DELETE").Inc()

 		blobURL := c.containerURL.NewBlobURL(key)
@@ -372,24 +367,24 @@ func newSnapshotIterator(ctx context.Context, generation string, client *Replica
 func (itr *snapshotIterator) fetch() error {
 	defer close(itr.ch)

-	dir, err := litestream.SnapshotsPath(itr.client.Path, itr.generation)
-	if err != nil {
-		return fmt.Errorf("cannot determine snapshots path: %w", err)
+	if itr.generation == "" {
+		return fmt.Errorf("generation required")
 	}

+	prefix := path.Join(itr.client.Path, "generations", itr.generation) + "/"
+
 	var marker azblob.Marker
 	for marker.NotDone() {
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()

-		resp, err := itr.client.containerURL.ListBlobsFlatSegment(itr.ctx, marker, azblob.ListBlobsSegmentOptions{Prefix: dir + "/"})
+		resp, err := itr.client.containerURL.ListBlobsFlatSegment(itr.ctx, marker, azblob.ListBlobsSegmentOptions{Prefix: prefix})
 		if err != nil {
 			return err
 		}
 		marker = resp.NextMarker

 		for _, item := range resp.Segment.BlobItems {
-			key := path.Base(item.Name)
-			index, err := litestream.ParseSnapshotPath(key)
+			index, err := internal.ParseSnapshotPath(path.Base(item.Name))
 			if err != nil {
 				continue
 			}
@@ -478,24 +473,24 @@ func newWALSegmentIterator(ctx context.Context, generation string, client *Repli
 func (itr *walSegmentIterator) fetch() error {
 	defer close(itr.ch)

-	dir, err := litestream.WALPath(itr.client.Path, itr.generation)
-	if err != nil {
-		return fmt.Errorf("cannot determine wal path: %w", err)
+	if itr.generation == "" {
+		return fmt.Errorf("generation required")
 	}
+	prefix := path.Join(itr.client.Path, "generations", itr.generation, "wal")

 	var marker azblob.Marker
 	for marker.NotDone() {
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()

-		resp, err := itr.client.containerURL.ListBlobsFlatSegment(itr.ctx, marker, azblob.ListBlobsSegmentOptions{Prefix: dir + "/"})
+		resp, err := itr.client.containerURL.ListBlobsFlatSegment(itr.ctx, marker, azblob.ListBlobsSegmentOptions{Prefix: prefix})
 		if err != nil {
 			return err
 		}
 		marker = resp.NextMarker

 		for _, item := range resp.Segment.BlobItems {
-			key := path.Base(item.Name)
-			index, offset, err := litestream.ParseWALSegmentPath(key)
+			key := strings.TrimPrefix(item.Name, prefix+"/")
+			index, offset, err := internal.ParseWALSegmentPath(key)
 			if err != nil {
 				continue
 			}
--- a/cmd/litestream/main.go
+++ b/cmd/litestream/main.go
@@ -17,7 +17,6 @@ import (
 	"strings"
 	"time"

-	"filippo.io/age"
 	"github.com/benbjohnson/litestream"
 	"github.com/benbjohnson/litestream/abs"
 	"github.com/benbjohnson/litestream/file"
@@ -86,17 +85,20 @@ func (m *Main) Run(ctx context.Context, args []string) (err error) {
 		}

 		// Setup signal handler.
+		ctx, cancel := context.WithCancel(ctx)
 		signalCh := signalChan()

-		if err := c.Run(); err != nil {
+		if err := c.Run(ctx); err != nil {
 			return err
 		}

 		// Wait for signal to stop program.
 		select {
 		case err = <-c.execCh:
+			cancel()
 			fmt.Println("subprocess exited, litestream shutting down")
 		case sig := <-signalCh:
+			cancel()
 			fmt.Println("signal received, litestream shutting down")

 			if c.cmd != nil {
@@ -247,7 +249,6 @@ func ReadConfigFile(filename string, expandEnv bool) (_ Config, err error) {
 // DBConfig represents the configuration for a single database.
 type DBConfig struct {
 	Path               string         `yaml:"path"`
-	MetaPath           *string        `yaml:"meta-path"`
 	MonitorInterval    *time.Duration `yaml:"monitor-interval"`
 	CheckpointInterval *time.Duration `yaml:"checkpoint-interval"`
 	MinCheckpointPageN *int           `yaml:"min-checkpoint-page-count"`
@@ -267,9 +268,6 @@ func NewDBFromConfig(dbc *DBConfig) (*litestream.DB, error) {
 	db := litestream.NewDB(path)

 	// Override default database settings if specified in configuration.
-	if dbc.MetaPath != nil {
-		db.SetMetaPath(*dbc.MetaPath)
-	}
 	if dbc.MonitorInterval != nil {
 		db.MonitorInterval = *dbc.MonitorInterval
 	}
@@ -325,12 +323,6 @@ type ReplicaConfig struct {
 	User     string `yaml:"user"`
 	Password string `yaml:"password"`
 	KeyPath  string `yaml:"key-path"`
-
-	// Encryption identities and recipients
-	Age struct {
-		Identities []string `yaml:"identities"`
-		Recipients []string `yaml:"recipients"`
-	} `yaml:"age"`
 }

 // NewReplicaFromConfig instantiates a replica for a DB based on a config.
@@ -357,22 +349,6 @@ func NewReplicaFromConfig(c *ReplicaConfig, db *litestream.DB) (_ *litestream.Re
 	if v := c.ValidationInterval; v != nil {
 		r.ValidationInterval = *v
 	}
-	for _, str := range c.Age.Identities {
-		identities, err := age.ParseIdentities(strings.NewReader(str))
-		if err != nil {
-			return nil, err
-		}
-
-		r.AgeIdentities = append(r.AgeIdentities, identities...)
-	}
-	for _, str := range c.Age.Recipients {
-		recipients, err := age.ParseRecipients(strings.NewReader(str))
-		if err != nil {
-			return nil, err
-		}
-
-		r.AgeRecipients = append(r.AgeRecipients, recipients...)
-	}

 	// Build and set client on replica.
 	switch c.ReplicaType() {
--- a/cmd/litestream/replicate.go
+++ b/cmd/litestream/replicate.go
@@ -94,7 +94,7 @@ func (c *ReplicateCommand) ParseFlags(ctx context.Context, args []string) (err e
 }

 // Run loads all databases specified in the configuration.
-func (c *ReplicateCommand) Run() (err error) {
+func (c *ReplicateCommand) Run(ctx context.Context) (err error) {
 	// Display version information.
 	log.Printf("litestream %s", Version)

@@ -162,7 +162,7 @@ func (c *ReplicateCommand) Run() (err error) {
 			return fmt.Errorf("cannot parse exec command: %w", err)
 		}

-		c.cmd = exec.Command(execArgs[0], execArgs[1:]...)
+		c.cmd = exec.CommandContext(ctx, execArgs[0], execArgs[1:]...)
 		c.cmd.Env = os.Environ()
 		c.cmd.Stdout = os.Stdout
 		c.cmd.Stderr = os.Stderr
@@ -178,7 +178,7 @@ func (c *ReplicateCommand) Run() (err error) {
 // Close closes all open databases.
 func (c *ReplicateCommand) Close() (err error) {
 	for _, db := range c.DBs {
-		if e := db.Close(); e != nil {
+		if e := db.SoftClose(); e != nil {
 			log.Printf("error closing db: path=%s err=%s", db.Path(), e)
 			if err == nil {
 				err = e
--- a/db.go
+++ b/db.go
@@ -16,6 +16,8 @@ import (
 	"math/rand"
 	"os"
 	"path/filepath"
+	"regexp"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -44,13 +46,11 @@ const BusyTimeout = 1 * time.Second
 type DB struct {
 	mu       sync.RWMutex
 	path     string        // part to database
-	metaPath string        // Path to the database metadata.
 	db       *sql.DB       // target database
 	f        *os.File      // long-running db file descriptor
 	rtx      *sql.Tx       // long running read transaction
 	pageSize int           // page size, in bytes
 	notify   chan struct{} // closes on WAL change
-	chkMu    sync.Mutex    // checkpoint lock

 	fileInfo os.FileInfo // db info cached during init
 	dirInfo  os.FileInfo // parent dir info cached during init
@@ -96,26 +96,18 @@ type DB struct {
 	// List of replicas for the database.
 	// Must be set before calling Open().
 	Replicas []*Replica
-
-	// Where to send log messages, defaults to log.Default()
-	Logger *log.Logger
 }

 // NewDB returns a new instance of DB for a given path.
 func NewDB(path string) *DB {
-	dir, file := filepath.Split(path)
-
 	db := &DB{
 		path:   path,
-		metaPath: filepath.Join(dir, "."+file+MetaDirSuffix),
 		notify: make(chan struct{}),

 		MinCheckpointPageN: DefaultMinCheckpointPageN,
 		MaxCheckpointPageN: DefaultMaxCheckpointPageN,
 		CheckpointInterval: DefaultCheckpointInterval,
 		MonitorInterval:    DefaultMonitorInterval,
-
-		Logger: log.Default(),
 	}

 	db.dbSizeGauge = dbSizeGaugeVec.WithLabelValues(db.path)
@@ -152,24 +144,20 @@ func (db *DB) WALPath() string {

 // MetaPath returns the path to the database metadata.
 func (db *DB) MetaPath() string {
-	return db.metaPath
-}
-
-// SetMetaPath sets the path to database metadata.
-func (db *DB) SetMetaPath(mp string) {
-	db.metaPath = mp
+	dir, file := filepath.Split(db.path)
+	return filepath.Join(dir, "."+file+MetaDirSuffix)
 }

 // GenerationNamePath returns the path of the name of the current generation.
 func (db *DB) GenerationNamePath() string {
-	return filepath.Join(db.metaPath, "generation")
+	return filepath.Join(db.MetaPath(), "generation")
 }

 // GenerationPath returns the path of a single generation.
 // Panics if generation is blank.
 func (db *DB) GenerationPath(generation string) string {
 	assert(generation != "", "generation name required")
-	return filepath.Join(db.metaPath, "generations", generation)
+	return filepath.Join(db.MetaPath(), "generations", generation)
 }

 // ShadowWALDir returns the path of the shadow wal directory.
@@ -182,7 +170,7 @@ func (db *DB) ShadowWALDir(generation string) string {
 // Panics if generation is blank or index is negative.
 func (db *DB) ShadowWALPath(generation string, index int) string {
 	assert(index >= 0, "shadow wal index cannot be negative")
-	return filepath.Join(db.ShadowWALDir(generation), FormatWALPath(index))
+	return filepath.Join(db.ShadowWALDir(generation), FormatIndex(index)+".wal")
 }

 // CurrentShadowWALPath returns the path to the last shadow WAL in a generation.
@@ -205,8 +193,8 @@ func (db *DB) CurrentShadowWALIndex(generation string) (index int, size int64, e

 	// Find highest wal index.
 	for _, fi := range fis {
-		if v, err := ParseWALPath(fi.Name()); err != nil {
-			continue // invalid wal filename
+		if v, err := parseWALPath(fi.Name()); err != nil {
+			continue // invalid filename
 		} else if v > index {
 			index = v
 		}
@@ -292,7 +280,7 @@ func (db *DB) Open() (err error) {
 	}

 	// Clear old temporary files that my have been left from a crash.
-	if err := removeTmpFiles(db.metaPath); err != nil {
+	if err := removeTmpFiles(db.MetaPath()); err != nil {
 		return fmt.Errorf("cannot remove tmp files: %w", err)
 	}

@@ -305,9 +293,20 @@ func (db *DB) Open() (err error) {
 	return nil
 }

-// Close flushes outstanding WAL writes to replicas, releases the read lock,
-// and closes the database.
+// Close releases the read lock & closes the database. This method should only
+// be called by tests as it causes the underlying database to be checkpointed.
 func (db *DB) Close() (err error) {
+	return db.close(false)
+}
+
+// SoftClose closes everything but the underlying db connection. This method
+// is available because the binary needs to avoid closing the database on exit
+// to prevent autocheckpointing.
+func (db *DB) SoftClose() (err error) {
+	return db.close(true)
+}
+
+func (db *DB) close(soft bool) (err error) {
 	db.cancel()
 	db.wg.Wait()

@@ -328,7 +327,7 @@ func (db *DB) Close() (err error) {
 				err = e
 			}
 		}
-		r.Stop(true)
+		r.Stop(!soft)
 	}

 	// Release the read lock to allow other applications to handle checkpointing.
@@ -338,7 +337,9 @@ func (db *DB) Close() (err error) {
 		}
 	}

-	if db.db != nil {
+	// Only perform full close if this is not a soft close.
+	// This closes the underlying database connection which can clean up the WAL.
+	if !soft && db.db != nil {
 		if e := db.db.Close(); e != nil && err == nil {
 			err = e
 		}
@@ -393,9 +394,8 @@ func (db *DB) init() (err error) {
 	dsn := db.path
 	dsn += fmt.Sprintf("?_busy_timeout=%d", BusyTimeout.Milliseconds())

-	// Connect to SQLite database. Use the driver registered with a hook to
-	// prevent WAL files from being removed.
-	if db.db, err = sql.Open("litestream-sqlite3", dsn); err != nil {
+	// Connect to SQLite database.
+	if db.db, err = sql.Open("sqlite3", dsn); err != nil {
 		return err
 	}

@@ -455,13 +455,13 @@ func (db *DB) init() (err error) {
 	}

 	// Ensure meta directory structure exists.
-	if err := internal.MkdirAll(db.metaPath, db.dirInfo); err != nil {
+	if err := internal.MkdirAll(db.MetaPath(), db.dirInfo); err != nil {
 		return err
 	}

 	// If we have an existing shadow WAL, ensure the headers match.
 	if err := db.verifyHeadersMatch(); err != nil {
-		db.Logger.Printf("%s: init: cannot determine last wal position, clearing generation; %s", db.path, err)
+		log.Printf("%s: init: cannot determine last wal position, clearing generation; %s", db.path, err)
 		if err := os.Remove(db.GenerationNamePath()); err != nil && !os.IsNotExist(err) {
 			return fmt.Errorf("remove generation name: %w", err)
 		}
@@ -531,7 +531,7 @@ func (db *DB) cleanGenerations() error {
 		return err
 	}

-	dir := filepath.Join(db.metaPath, "generations")
+	dir := filepath.Join(db.MetaPath(), "generations")
 	fis, err := ioutil.ReadDir(dir)
 	if os.IsNotExist(err) {
 		return nil
@@ -586,7 +586,7 @@ func (db *DB) cleanWAL() error {
 		return err
 	}
 	for _, fi := range fis {
-		if idx, err := ParseWALPath(fi.Name()); err != nil || idx >= min {
+		if idx, err := parseWALPath(fi.Name()); err != nil || idx >= min {
 			continue
 		}
 		if err := os.Remove(filepath.Join(dir, fi.Name())); err != nil {
@@ -661,7 +661,7 @@ func (db *DB) createGeneration() (string, error) {
 	generation := hex.EncodeToString(buf)

 	// Generate new directory.
-	dir := filepath.Join(db.metaPath, "generations", generation)
+	dir := filepath.Join(db.MetaPath(), "generations", generation)
 	if err := internal.MkdirAll(dir, db.dirInfo); err != nil {
 		return "", err
 	}
@@ -740,7 +740,7 @@ func (db *DB) Sync(ctx context.Context) (err error) {
 		if info.generation, err = db.createGeneration(); err != nil {
 			return fmt.Errorf("create generation: %w", err)
 		}
-		db.Logger.Printf("%s: sync: new generation %q, %s", db.path, info.generation, info.reason)
+		log.Printf("%s: sync: new generation %q, %s", db.path, info.generation, info.reason)

 		// Clear shadow wal info.
 		info.shadowWALPath = db.ShadowWALPath(info.generation, 0)
@@ -930,13 +930,13 @@ func (db *DB) syncWAL(info syncInfo) (newSize int64, err error) {

 	// Parse index of current shadow WAL file.
 	dir, base := filepath.Split(info.shadowWALPath)
-	index, err := ParseWALPath(base)
+	index, err := parseWALPath(base)
 	if err != nil {
 		return 0, fmt.Errorf("cannot parse shadow wal filename: %s", base)
 	}

 	// Start a new shadow WAL file with next index.
-	newShadowWALPath := filepath.Join(dir, FormatWALPath(index+1))
+	newShadowWALPath := filepath.Join(dir, formatWALPath(index+1))
 	newSize, err = db.initShadowWALFile(newShadowWALPath)
 	if err != nil {
 		return 0, fmt.Errorf("cannot init shadow wal file: name=%s err=%w", newShadowWALPath, err)
@@ -1024,16 +1024,6 @@ func (db *DB) copyToShadowWAL(filename string) (newSize int64, err error) {
 		return 0, fmt.Errorf("last checksum: %w", err)
 	}

-	// Write to a temporary shadow file.
-	tempFilename := filename + ".tmp"
-	defer os.Remove(tempFilename)
-
-	f, err := internal.CreateFile(tempFilename, db.fileInfo)
-	if err != nil {
-		return 0, fmt.Errorf("create temp file: %w", err)
-	}
-	defer f.Close()
-
 	// Seek to correct position on real wal.
 	if _, err := r.Seek(origSize, io.SeekStart); err != nil {
 		return 0, fmt.Errorf("real wal seek: %w", err)
@@ -1044,6 +1034,7 @@ func (db *DB) copyToShadowWAL(filename string) (newSize int64, err error) {
 	// Read through WAL from last position to find the page of the last
 	// committed transaction.
 	frame := make([]byte, db.pageSize+WALFrameHeaderSize)
+	var buf bytes.Buffer
 	offset := origSize
 	lastCommitSize := origSize
 	for {
@@ -1073,46 +1064,24 @@ func (db *DB) copyToShadowWAL(filename string) (newSize int64, err error) {
 			break
 		}

-		// Write page to temporary WAL file.
-		if _, err := f.Write(frame); err != nil {
-			return 0, fmt.Errorf("write temp shadow wal: %w", err)
-		}
+		// Add page to the new size of the shadow WAL.
+		buf.Write(frame)

 		Tracef("%s: copy-shadow: ok %s offset=%d salt=%x %x", db.path, filename, offset, salt0, salt1)
 		offset += int64(len(frame))

-		// Update new size if written frame was a commit record.
+		// Flush to shadow WAL if commit record.
 		newDBSize := binary.BigEndian.Uint32(frame[4:])
 		if newDBSize != 0 {
+			if _, err := buf.WriteTo(w); err != nil {
+				return 0, fmt.Errorf("write shadow wal: %w", err)
+			}
+			buf.Reset()
 			lastCommitSize = offset
 		}
 	}

-	// If no WAL writes found, exit.
-	if origSize == lastCommitSize {
-		return origSize, nil
-	}
-
-	walByteN := lastCommitSize - origSize
-
-	// Move to beginning of temporary file.
-	if _, err := f.Seek(0, io.SeekStart); err != nil {
-		return 0, fmt.Errorf("temp file seek: %w", err)
-	}
-
-	// Copy from temporary file to shadow WAL.
-	if _, err := io.Copy(w, &io.LimitedReader{R: f, N: walByteN}); err != nil {
-		return 0, fmt.Errorf("write shadow file: %w", err)
-	}
-
-	// Close & remove temporary file.
-	if err := f.Close(); err != nil {
-		return 0, err
-	} else if err := os.Remove(tempFilename); err != nil {
-		return 0, err
-	}
-
-	// Sync & close shadow WAL.
+	// Sync & close.
 	if err := w.Sync(); err != nil {
 		return 0, err
 	} else if err := w.Close(); err != nil {
@@ -1120,7 +1089,7 @@ func (db *DB) copyToShadowWAL(filename string) (newSize int64, err error) {
 	}

 	// Track total number of bytes written to WAL.
-	db.totalWALBytesCounter.Add(float64(walByteN))
+	db.totalWALBytesCounter.Add(float64(lastCommitSize - origSize))

 	return lastCommitSize, nil
 }
@@ -1279,12 +1248,6 @@ func (db *DB) Checkpoint(ctx context.Context, mode string) (err error) {
 // checkpointAndInit performs a checkpoint on the WAL file and initializes a
 // new shadow WAL file.
 func (db *DB) checkpoint(ctx context.Context, generation, mode string) error {
-	// Try getting a checkpoint lock, will fail during snapshots.
-	if !db.chkMu.TryLock() {
-		return nil
-	}
-	defer db.chkMu.Unlock()
-
 	shadowWALPath, err := db.CurrentShadowWALPath(generation)
 	if err != nil {
 		return err
@@ -1337,13 +1300,13 @@ func (db *DB) checkpoint(ctx context.Context, generation, mode string) error {
 	}

 	// Parse index of current shadow WAL file.
-	index, err := ParseWALPath(shadowWALPath)
+	index, err := parseWALPath(shadowWALPath)
 	if err != nil {
 		return fmt.Errorf("cannot parse shadow wal filename: %s", shadowWALPath)
 	}

 	// Start a new shadow WAL file with next index.
-	newShadowWALPath := filepath.Join(filepath.Dir(shadowWALPath), FormatWALPath(index+1))
+	newShadowWALPath := filepath.Join(filepath.Dir(shadowWALPath), formatWALPath(index+1))
 	if _, err := db.initShadowWALFile(newShadowWALPath); err != nil {
 		return fmt.Errorf("cannot init shadow wal file: name=%s err=%w", newShadowWALPath, err)
 	}
@@ -1416,7 +1379,7 @@ func (db *DB) monitor() {

 		// Sync the database to the shadow WAL.
 		if err := db.Sync(db.ctx); err != nil && !errors.Is(err, context.Canceled) {
-			db.Logger.Printf("%s: sync error: %s", db.path, err)
+			log.Printf("%s: sync error: %s", db.path, err)
 		}
 	}
 }
@@ -1458,7 +1421,7 @@ func applyWAL(ctx context.Context, index int, dbPath string) error {
 	}

 	// Open SQLite database and force a truncating checkpoint.
-	d, err := sql.Open("litestream-sqlite3", dbPath)
+	d, err := sql.Open("sqlite3", dbPath)
 	if err != nil {
 		return err
 	}
@@ -1520,19 +1483,28 @@ func (db *DB) CRC64(ctx context.Context) (uint64, Pos, error) {
 	return h.Sum64(), pos, nil
 }

-// BeginSnapshot takes an internal snapshot lock preventing checkpoints.
-//
-// When calling this the caller must also call EndSnapshot() once the snapshot
-// is finished.
-func (db *DB) BeginSnapshot() {
-	db.chkMu.Lock()
+// parseWALPath returns the index for the WAL file.
+// Returns an error if the path is not a valid WAL path.
+func parseWALPath(s string) (index int, err error) {
+	s = filepath.Base(s)
+
+	a := walPathRegex.FindStringSubmatch(s)
+	if a == nil {
+		return 0, fmt.Errorf("invalid wal path: %s", s)
 	}

-// EndSnapshot releases the internal snapshot lock that prevents checkpoints.
-func (db *DB) EndSnapshot() {
-	db.chkMu.Unlock()
+	i64, _ := strconv.ParseUint(a[1], 16, 64)
+	return int(i64), nil
 }

+// formatWALPath formats a WAL filename with a given index.
+func formatWALPath(index int) string {
+	assert(index >= 0, "wal index must be non-negative")
+	return FormatIndex(index) + ".wal"
+}
+
+var walPathRegex = regexp.MustCompile(`^([0-9a-f]{8})\.wal$`)
+
 // DefaultRestoreParallelism is the default parallelism when downloading WAL files.
 const DefaultRestoreParallelism = 8

--- a/db_test.go
+++ b/db_test.go
@@ -270,8 +270,8 @@ func TestDB_Sync(t *testing.T) {
 			t.Fatal(err)
 		}

-		// Remove WAL file.
-		if err := os.Remove(db.WALPath()); err != nil {
+		// Verify WAL does not exist.
+		if _, err := os.Stat(db.WALPath()); !os.IsNotExist(err) {
 			t.Fatal(err)
 		}

--- a/file/replica_client.go
+++ b/file/replica_client.go
@@ -8,6 +8,7 @@ import (
 	"os"
 	"path/filepath"
 	"sort"
+	"strings"

 	"github.com/benbjohnson/litestream"
 	"github.com/benbjohnson/litestream/internal"
@@ -84,7 +85,7 @@ func (c *ReplicaClient) SnapshotPath(generation string, index int) (string, erro
 	if err != nil {
 		return "", err
 	}
-	return filepath.Join(dir, litestream.FormatSnapshotPath(index)), nil
+	return filepath.Join(dir, litestream.FormatIndex(index)+".snapshot.lz4"), nil
 }

 // WALDir returns the path to a generation's WAL directory
@@ -102,7 +103,7 @@ func (c *ReplicaClient) WALSegmentPath(generation string, index int, offset int6
 	if err != nil {
 		return "", err
 	}
-	return filepath.Join(dir, litestream.FormatWALSegmentPath(index, offset)), nil
+	return filepath.Join(dir, litestream.FormatIndex(index), fmt.Sprintf("%08x.wal.lz4", offset)), nil
 }

 // Generations returns a list of available generation names.
@@ -168,7 +169,7 @@ func (c *ReplicaClient) Snapshots(ctx context.Context, generation string) (lites
 	infos := make([]litestream.SnapshotInfo, 0, len(fis))
 	for _, fi := range fis {
 		// Parse index from filename.
-		index, err := litestream.ParseSnapshotPath(fi.Name())
+		index, err := internal.ParseSnapshotPath(filepath.Base(fi.Name()))
 		if err != nil {
 			continue
 		}
@@ -281,26 +282,18 @@ func (c *ReplicaClient) WALSegments(ctx context.Context, generation string) (lit
 	}

 	// Iterate over every file and convert to metadata.
-	infos := make([]litestream.WALSegmentInfo, 0, len(fis))
+	indexes := make([]int, 0, len(fis))
 	for _, fi := range fis {
-		// Parse index from filename.
-		index, offset, err := litestream.ParseWALSegmentPath(fi.Name())
-		if err != nil {
+		index, err := litestream.ParseIndex(fi.Name())
+		if err != nil || !fi.IsDir() {
 			continue
 		}
-
-		infos = append(infos, litestream.WALSegmentInfo{
-			Generation: generation,
-			Index:      index,
-			Offset:     offset,
-			Size:       fi.Size(),
-			CreatedAt:  fi.ModTime().UTC(),
-		})
+		indexes = append(indexes, index)
 	}

-	sort.Sort(litestream.WALSegmentInfoSlice(infos))
+	sort.Ints(indexes)

-	return litestream.NewWALSegmentInfoSliceIterator(infos), nil
+	return newWALSegmentIterator(dir, generation, indexes), nil
 }

 // WriteWALSegment writes LZ4 compressed data from rd into a file on disk.
@@ -379,3 +372,97 @@ func (c *ReplicaClient) DeleteWALSegments(ctx context.Context, a []litestream.Po
 	}
 	return nil
 }
+
+type walSegmentIterator struct {
+	dir        string
+	generation string
+	indexes    []int
+
+	infos []litestream.WALSegmentInfo
+	err   error
+}
+
+func newWALSegmentIterator(dir, generation string, indexes []int) *walSegmentIterator {
+	return &walSegmentIterator{
+		dir:        dir,
+		generation: generation,
+		indexes:    indexes,
+	}
+}
+
+func (itr *walSegmentIterator) Close() (err error) {
+	return itr.err
+}
+
+func (itr *walSegmentIterator) Next() bool {
+	// Exit if an error has already occurred.
+	if itr.err != nil {
+		return false
+	}
+
+	for {
+		// Move to the next segment in cache, if available.
+		if len(itr.infos) > 1 {
+			itr.infos = itr.infos[1:]
+			return true
+		}
+		itr.infos = itr.infos[:0] // otherwise clear infos
+
+		// Move to the next index unless this is the first time initializing.
+		if itr.infos != nil && len(itr.indexes) > 0 {
+			itr.indexes = itr.indexes[1:]
+		}
+
+		// If no indexes remain, stop iteration.
+		if len(itr.indexes) == 0 {
+			return false
+		}
+
+		// Read segments into a cache for the current index.
+		index := itr.indexes[0]
+		f, err := os.Open(filepath.Join(itr.dir, litestream.FormatIndex(index)))
+		if err != nil {
+			itr.err = err
+			return false
+		}
+		defer f.Close()
+
+		fis, err := f.Readdir(-1)
+		if err != nil {
+			itr.err = err
+			return false
+		}
+		for _, fi := range fis {
+			filename := filepath.Base(fi.Name())
+			if fi.IsDir() {
+				continue
+			}
+
+			offset, err := litestream.ParseOffset(strings.TrimSuffix(filename, ".wal.lz4"))
+			if err != nil {
+				continue
+			}
+
+			itr.infos = append(itr.infos, litestream.WALSegmentInfo{
+				Generation: itr.generation,
+				Index:      index,
+				Offset:     offset,
+				Size:       fi.Size(),
+				CreatedAt:  fi.ModTime().UTC(),
+			})
+		}
+
+		if len(itr.infos) > 0 {
+			return true
+		}
+	}
+}
+
+func (itr *walSegmentIterator) Err() error { return itr.err }
+
+func (itr *walSegmentIterator) WALSegment() litestream.WALSegmentInfo {
+	if len(itr.infos) == 0 {
+		return litestream.WALSegmentInfo{}
+	}
+	return itr.infos[0]
+}
--- a/file/replica_client_test.go
+++ b/file/replica_client_test.go
@@ -118,7 +118,7 @@ func TestReplicaClient_WALSegmentPath(t *testing.T) {
 	t.Run("OK", func(t *testing.T) {
 		if got, err := file.NewReplicaClient("/foo").WALSegmentPath("0123456701234567", 1000, 1001); err != nil {
 			t.Fatal(err)
-		} else if want := "/foo/generations/0123456701234567/wal/000003e8_000003e9.wal.lz4"; got != want {
+		} else if want := "/foo/generations/0123456701234567/wal/000003e8/000003e9.wal.lz4"; got != want {
 			t.Fatalf("WALPath()=%v, want %v", got, want)
 		}
 	})
--- a/gcs/replica_client.go
+++ b/gcs/replica_client.go
@@ -68,7 +68,7 @@ func (c *ReplicaClient) Generations(ctx context.Context) ([]string, error) {
 	// Construct query to only pull generation directory names.
 	query := &storage.Query{
 		Delimiter: "/",
-		Prefix:    litestream.GenerationsPath(c.Path) + "/",
+		Prefix:    path.Join(c.Path, "generations") + "/",
 	}

 	// Loop over results and only build list of generation-formatted names.
@@ -96,16 +96,15 @@ func (c *ReplicaClient) Generations(ctx context.Context) ([]string, error) {
 func (c *ReplicaClient) DeleteGeneration(ctx context.Context, generation string) error {
 	if err := c.Init(ctx); err != nil {
 		return err
+	} else if generation == "" {
+		return fmt.Errorf("generation required")
 	}

-	dir, err := litestream.GenerationPath(c.Path, generation)
-	if err != nil {
-		return fmt.Errorf("cannot determine generation path: %w", err)
-	}
+	prefix := path.Join(c.Path, "generations", generation) + "/"

 	// Iterate over every object in generation and delete it.
 	internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()
-	for it := c.bkt.Objects(ctx, &storage.Query{Prefix: dir + "/"}); ; {
+	for it := c.bkt.Objects(ctx, &storage.Query{Prefix: prefix}); ; {
 		attrs, err := it.Next()
 		if err == iterator.Done {
 			break
@@ -130,24 +129,22 @@ func (c *ReplicaClient) DeleteGeneration(ctx context.Context, generation string)
 func (c *ReplicaClient) Snapshots(ctx context.Context, generation string) (litestream.SnapshotIterator, error) {
 	if err := c.Init(ctx); err != nil {
 		return nil, err
+	} else if generation == "" {
+		return nil, fmt.Errorf("generation required")
 	}
-	dir, err := litestream.SnapshotsPath(c.Path, generation)
-	if err != nil {
-		return nil, fmt.Errorf("cannot determine snapshots path: %w", err)
-	}
-	return newSnapshotIterator(generation, c.bkt.Objects(ctx, &storage.Query{Prefix: dir + "/"})), nil
+	prefix := path.Join(c.Path, "generations", generation) + "/"
+	return newSnapshotIterator(generation, c.bkt.Objects(ctx, &storage.Query{Prefix: prefix})), nil
 }

 // WriteSnapshot writes LZ4 compressed data from rd to the object storage.
 func (c *ReplicaClient) WriteSnapshot(ctx context.Context, generation string, index int, rd io.Reader) (info litestream.SnapshotInfo, err error) {
 	if err := c.Init(ctx); err != nil {
 		return info, err
+	} else if generation == "" {
+		return info, fmt.Errorf("generation required")
 	}

-	key, err := litestream.SnapshotPath(c.Path, generation, index)
-	if err != nil {
-		return info, fmt.Errorf("cannot determine snapshot path: %w", err)
-	}
+	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")
 	startTime := time.Now()

 	w := c.bkt.Object(key).NewWriter(ctx)
@@ -177,12 +174,11 @@ func (c *ReplicaClient) WriteSnapshot(ctx context.Context, generation string, in
 func (c *ReplicaClient) SnapshotReader(ctx context.Context, generation string, index int) (io.ReadCloser, error) {
 	if err := c.Init(ctx); err != nil {
 		return nil, err
+	} else if generation == "" {
+		return nil, fmt.Errorf("generation required")
 	}

-	key, err := litestream.SnapshotPath(c.Path, generation, index)
-	if err != nil {
-		return nil, fmt.Errorf("cannot determine snapshot path: %w", err)
-	}
+	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")

 	r, err := c.bkt.Object(key).NewReader(ctx)
 	if isNotExists(err) {
@@ -201,12 +197,11 @@ func (c *ReplicaClient) SnapshotReader(ctx context.Context, generation string, i
 func (c *ReplicaClient) DeleteSnapshot(ctx context.Context, generation string, index int) error {
 	if err := c.Init(ctx); err != nil {
 		return err
+	} else if generation == "" {
+		return fmt.Errorf("generation required")
 	}

-	key, err := litestream.SnapshotPath(c.Path, generation, index)
-	if err != nil {
-		return fmt.Errorf("cannot determine snapshot path: %w", err)
-	}
+	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index), ".snapshot.lz4")

 	if err := c.bkt.Object(key).Delete(ctx); err != nil && !isNotExists(err) {
 		return fmt.Errorf("cannot delete snapshot %q: %w", key, err)
@@ -220,24 +215,22 @@ func (c *ReplicaClient) DeleteSnapshot(ctx context.Context, generation string, i
 func (c *ReplicaClient) WALSegments(ctx context.Context, generation string) (litestream.WALSegmentIterator, error) {
 	if err := c.Init(ctx); err != nil {
 		return nil, err
+	} else if generation == "" {
+		return nil, fmt.Errorf("generation required")
 	}
-	dir, err := litestream.WALPath(c.Path, generation)
-	if err != nil {
-		return nil, fmt.Errorf("cannot determine wal path: %w", err)
-	}
-	return newWALSegmentIterator(generation, c.bkt.Objects(ctx, &storage.Query{Prefix: dir + "/"})), nil
+	prefix := path.Join(c.Path, "generations", generation, "wal") + "/"
+	return newWALSegmentIterator(generation, prefix, c.bkt.Objects(ctx, &storage.Query{Prefix: prefix})), nil
 }

 // WriteWALSegment writes LZ4 compressed data from rd into a file on disk.
 func (c *ReplicaClient) WriteWALSegment(ctx context.Context, pos litestream.Pos, rd io.Reader) (info litestream.WALSegmentInfo, err error) {
 	if err := c.Init(ctx); err != nil {
 		return info, err
+	} else if pos.Generation == "" {
+		return info, fmt.Errorf("generation required")
 	}

-	key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
-	if err != nil {
-		return info, fmt.Errorf("cannot determine wal segment path: %w", err)
-	}
+	key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
 	startTime := time.Now()

 	w := c.bkt.Object(key).NewWriter(ctx)
@@ -267,12 +260,11 @@ func (c *ReplicaClient) WriteWALSegment(ctx context.Context, pos litestream.Pos,
 func (c *ReplicaClient) WALSegmentReader(ctx context.Context, pos litestream.Pos) (io.ReadCloser, error) {
 	if err := c.Init(ctx); err != nil {
 		return nil, err
+	} else if pos.Generation == "" {
+		return nil, fmt.Errorf("generation required")
 	}

-	key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
-	if err != nil {
-		return nil, fmt.Errorf("cannot determine wal segment path: %w", err)
-	}
+	key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")

 	r, err := c.bkt.Object(key).NewReader(ctx)
 	if isNotExists(err) {
@@ -294,11 +286,11 @@ func (c *ReplicaClient) DeleteWALSegments(ctx context.Context, a []litestream.Po
 	}

 	for _, pos := range a {
-		key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
-		if err != nil {
-			return fmt.Errorf("cannot determine wal segment path: %w", err)
+		if pos.Generation == "" {
+			return fmt.Errorf("generation required")
 		}

+		key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
 		if err := c.bkt.Object(key).Delete(ctx); err != nil && !isNotExists(err) {
 			return fmt.Errorf("cannot delete wal segment %q: %w", key, err)
 		}
@@ -344,7 +336,7 @@ func (itr *snapshotIterator) Next() bool {
 		}

 		// Parse index, otherwise skip to the next object.
-		index, err := litestream.ParseSnapshotPath(path.Base(attrs.Name))
+		index, err := internal.ParseSnapshotPath(path.Base(attrs.Name))
 		if err != nil {
 			continue
 		}
@@ -366,15 +358,17 @@ func (itr *snapshotIterator) Snapshot() litestream.SnapshotInfo { return itr.inf

 type walSegmentIterator struct {
 	generation string
+	prefix     string

 	it   *storage.ObjectIterator
 	info litestream.WALSegmentInfo
 	err  error
 }

-func newWALSegmentIterator(generation string, it *storage.ObjectIterator) *walSegmentIterator {
+func newWALSegmentIterator(generation, prefix string, it *storage.ObjectIterator) *walSegmentIterator {
 	return &walSegmentIterator{
 		generation: generation,
+		prefix:     prefix,
 		it:         it,
 	}
 }
@@ -400,7 +394,7 @@ func (itr *walSegmentIterator) Next() bool {
 		}

 		// Parse index & offset, otherwise skip to the next object.
-		index, offset, err := litestream.ParseWALSegmentPath(path.Base(attrs.Name))
+		index, offset, err := internal.ParseWALSegmentPath(strings.TrimPrefix(attrs.Name, itr.prefix))
 		if err != nil {
 			continue
 		}
--- a/go.mod
+++ b/go.mod
@@ -1,55 +1,21 @@
 module github.com/benbjohnson/litestream

-go 1.19
+go 1.16

 require (
-	cloud.google.com/go/storage v1.31.0
-	filippo.io/age v1.1.1
-	github.com/Azure/azure-storage-blob-go v0.15.0
-	github.com/aws/aws-sdk-go v1.44.318
-	github.com/mattn/go-shellwords v1.0.12
-	github.com/mattn/go-sqlite3 v1.14.17
-	github.com/pierrec/lz4/v4 v4.1.18
-	github.com/pkg/sftp v1.13.5
-	github.com/prometheus/client_golang v1.16.0
-	golang.org/x/crypto v0.12.0
-	golang.org/x/sync v0.3.0
-	golang.org/x/sys v0.11.0
-	google.golang.org/api v0.135.0
+	cloud.google.com/go/storage v1.15.0
+	github.com/Azure/azure-storage-blob-go v0.13.0 // indirect
+	github.com/Azure/go-autorest/autorest v0.9.0 // indirect
+	github.com/aws/aws-sdk-go v1.27.0
+	github.com/davecgh/go-spew v1.1.1
+	github.com/mattn/go-shellwords v1.0.11 // indirect
+	github.com/mattn/go-sqlite3 v1.14.5
+	github.com/pierrec/lz4/v4 v4.1.3
+	github.com/pkg/sftp v1.13.0 // indirect
+	github.com/prometheus/client_golang v1.9.0
+	golang.org/x/crypto v0.0.0-20210513164829-c07d793c2f9a // indirect
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
+	golang.org/x/sys v0.0.0-20210412220455-f1c623a9e750
+	google.golang.org/api v0.45.0
 	gopkg.in/yaml.v2 v2.4.0
 )
-
-require (
-	cloud.google.com/go v0.110.7 // indirect
-	cloud.google.com/go/compute v1.23.0 // indirect
-	cloud.google.com/go/compute/metadata v0.2.3 // indirect
-	cloud.google.com/go/iam v1.1.1 // indirect
-	github.com/Azure/azure-pipeline-go v0.2.3 // indirect
-	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/cespare/xxhash/v2 v2.2.0 // indirect
-	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
-	github.com/golang/protobuf v1.5.3 // indirect
-	github.com/google/go-cmp v0.5.9 // indirect
-	github.com/google/s2a-go v0.1.4 // indirect
-	github.com/google/uuid v1.3.0 // indirect
-	github.com/googleapis/enterprise-certificate-proxy v0.2.5 // indirect
-	github.com/googleapis/gax-go/v2 v2.12.0 // indirect
-	github.com/jmespath/go-jmespath v0.4.0 // indirect
-	github.com/kr/fs v0.1.0 // indirect
-	github.com/mattn/go-ieproxy v0.0.11 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
-	github.com/prometheus/client_model v0.4.0 // indirect
-	github.com/prometheus/common v0.44.0 // indirect
-	github.com/prometheus/procfs v0.11.1 // indirect
-	go.opencensus.io v0.24.0 // indirect
-	golang.org/x/net v0.14.0 // indirect
-	golang.org/x/oauth2 v0.11.0 // indirect
-	golang.org/x/text v0.12.0 // indirect
-	golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect
-	google.golang.org/appengine v1.6.7 // indirect
-	google.golang.org/genproto v0.0.0-20230807174057-1744710a1577 // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20230807174057-1744710a1577 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20230807174057-1744710a1577 // indirect
-	google.golang.org/grpc v1.57.0 // indirect
-	google.golang.org/protobuf v1.31.0 // indirect
-)
--- a/go.sum
+++ b/go.sum
@@ -1,70 +1,164 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.110.7 h1:rJyC7nWRg2jWGZ4wSJ5nY65GTdYJkg0cd/uXb+ACI6o=
-cloud.google.com/go v0.110.7/go.mod h1:+EYjdK8e5RME/VY/qLCAtuyALQ9q67dvuum8i+H5xsI=
-cloud.google.com/go/compute v1.23.0 h1:tP41Zoavr8ptEqaW6j+LQOnyBBhO7OkOMAGrgLopTwY=
-cloud.google.com/go/compute v1.23.0/go.mod h1:4tCnrn48xsqlwSAiLf1HXMQk8CONslYbdiEZc9FEIbM=
-cloud.google.com/go/compute/metadata v0.2.3 h1:mg4jlk7mCAj6xXp9UJ4fjI9VUI5rubuGBW5aJ7UnBMY=
-cloud.google.com/go/compute/metadata v0.2.3/go.mod h1:VAV5nSsACxMJvgaAuX6Pk2AawlZn8kiOGuCv6gTkwuA=
-cloud.google.com/go/iam v1.1.1 h1:lW7fzj15aVIXYHREOqjRBV9PsH0Z6u8Y46a1YGvQP4Y=
-cloud.google.com/go/iam v1.1.1/go.mod h1:A5avdyVL2tCppe4unb0951eI9jreack+RJ0/d+KUZOU=
-cloud.google.com/go/storage v1.31.0 h1:+S3LjjEN2zZ+L5hOwj4+1OkGCsLVe0NzpXKQ1pSdTCI=
-cloud.google.com/go/storage v1.31.0/go.mod h1:81ams1PrhW16L4kF7qg+4mTq7SRs5HsbDTM0bWvrwJ0=
-filippo.io/age v1.1.1 h1:pIpO7l151hCnQ4BdyBujnGP2YlUo0uj6sAVNHGBvXHg=
-filippo.io/age v1.1.1/go.mod h1:l03SrzDUrBkdBx8+IILdnn2KZysqQdbEBUQ4p3sqEQE=
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--- a/internal/internal.go
+++ b/internal/internal.go
@@ -1,8 +1,11 @@
 package internal

 import (
+	"fmt"
 	"io"
 	"os"
+	"regexp"
+	"strconv"
 	"syscall"

 	"github.com/prometheus/client_golang/prometheus"
@@ -127,6 +130,33 @@ func MkdirAll(path string, fi os.FileInfo) error {
 	return nil
 }

+// ParseSnapshotPath parses the index from a snapshot filename. Used by path-based replicas.
+func ParseSnapshotPath(s string) (index int, err error) {
+	a := snapshotPathRegex.FindStringSubmatch(s)
+	if a == nil {
+		return 0, fmt.Errorf("invalid snapshot path")
+	}
+
+	i64, _ := strconv.ParseUint(a[1], 16, 64)
+	return int(i64), nil
+}
+
+var snapshotPathRegex = regexp.MustCompile(`^([0-9a-f]{8})\.snapshot\.lz4$`)
+
+// ParseWALSegmentPath parses the index/offset from a segment filename. Used by path-based replicas.
+func ParseWALSegmentPath(s string) (index int, offset int64, err error) {
+	a := walSegmentPathRegex.FindStringSubmatch(s)
+	if a == nil {
+		return 0, 0, fmt.Errorf("invalid wal segment path")
+	}
+
+	i64, _ := strconv.ParseUint(a[1], 16, 64)
+	off64, _ := strconv.ParseUint(a[2], 16, 64)
+	return int(i64), int64(off64), nil
+}
+
+var walSegmentPathRegex = regexp.MustCompile(`^([0-9a-f]{8})\/([0-9a-f]{8})\.wal\.lz4$`)
+
 // Shared replica metrics.
 var (
 	OperationTotalCounterVec = promauto.NewCounterVec(prometheus.CounterOpts{
--- a/internal/internal_test.go
+++ b/internal/internal_test.go
@@ -0,0 +1,61 @@
+package internal_test
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+
+	"github.com/benbjohnson/litestream/internal"
+)
+
+func TestParseSnapshotPath(t *testing.T) {
+	for _, tt := range []struct {
+		s     string
+		index int
+		err   error
+	}{
+		{"00bc614e.snapshot.lz4", 12345678, nil},
+		{"xxxxxxxx.snapshot.lz4", 0, fmt.Errorf("invalid snapshot path")},
+		{"00bc614.snapshot.lz4", 0, fmt.Errorf("invalid snapshot path")},
+		{"00bc614e.snapshot.lz", 0, fmt.Errorf("invalid snapshot path")},
+		{"00bc614e.snapshot", 0, fmt.Errorf("invalid snapshot path")},
+		{"00bc614e", 0, fmt.Errorf("invalid snapshot path")},
+		{"", 0, fmt.Errorf("invalid snapshot path")},
+	} {
+		t.Run("", func(t *testing.T) {
+			index, err := internal.ParseSnapshotPath(tt.s)
+			if got, want := index, tt.index; got != want {
+				t.Errorf("index=%#v, want %#v", got, want)
+			} else if got, want := err, tt.err; !reflect.DeepEqual(got, want) {
+				t.Errorf("err=%#v, want %#v", got, want)
+			}
+		})
+	}
+}
+
+func TestParseWALSegmentPath(t *testing.T) {
+	for _, tt := range []struct {
+		s      string
+		index  int
+		offset int64
+		err    error
+	}{
+		{"00bc614e/000003e8.wal.lz4", 12345678, 1000, nil},
+		{"00000000/00000000.wal", 0, 0, fmt.Errorf("invalid wal segment path")},
+		{"00000000/00000000", 0, 0, fmt.Errorf("invalid wal segment path")},
+		{"00000000/", 0, 0, fmt.Errorf("invalid wal segment path")},
+		{"00000000", 0, 0, fmt.Errorf("invalid wal segment path")},
+		{"", 0, 0, fmt.Errorf("invalid wal segment path")},
+	} {
+		t.Run("", func(t *testing.T) {
+			index, offset, err := internal.ParseWALSegmentPath(tt.s)
+			if got, want := index, tt.index; got != want {
+				t.Errorf("index=%#v, want %#v", got, want)
+			} else if got, want := offset, tt.offset; got != want {
+				t.Errorf("offset=%#v, want %#v", got, want)
+			} else if got, want := err, tt.err; !reflect.DeepEqual(got, want) {
+				t.Errorf("err=%#v, want %#v", got, want)
+			}
+		})
+	}
+}
--- a/litestream.go
+++ b/litestream.go
@@ -7,14 +7,10 @@ import (
 	"fmt"
 	"io"
 	"os"
-	"path"
 	"path/filepath"
-	"regexp"
 	"strconv"
 	"strings"
 	"time"
-
-	"github.com/mattn/go-sqlite3"
 )

 // Naming constants.
@@ -44,25 +40,6 @@ var (
 	ErrChecksumMismatch = errors.New("invalid replica, checksum mismatch")
 )

-var (
-	// LogWriter is the destination writer for all logging.
-	LogWriter = os.Stdout
-
-	// LogFlags are the flags passed to log.New().
-	LogFlags = 0
-)
-
-func init() {
-	sql.Register("litestream-sqlite3", &sqlite3.SQLiteDriver{
-		ConnectHook: func(conn *sqlite3.SQLiteConn) error {
-			if err := conn.SetFileControlInt("main", sqlite3.SQLITE_FCNTL_PERSIST_WAL, 1); err != nil {
-				return fmt.Errorf("cannot set file control: %w", err)
-			}
-			return nil
-		},
-	})
-}
-
 // SnapshotIterator represents an iterator over a collection of snapshot metadata.
 type SnapshotIterator interface {
 	io.Closer
@@ -228,13 +205,11 @@ func FilterSnapshotsAfter(a []SnapshotInfo, t time.Time) []SnapshotInfo {
 // FindMinSnapshotByGeneration finds the snapshot with the lowest index in a generation.
 func FindMinSnapshotByGeneration(a []SnapshotInfo, generation string) *SnapshotInfo {
 	var min *SnapshotInfo
-	for i := range a {
-		snapshot := &a[i]
-
+	for _, snapshot := range a {
 		if snapshot.Generation != generation {
 			continue
 		} else if min == nil || snapshot.Index < min.Index {
-			min = snapshot
+			min = &snapshot
 		}
 	}
 	return min
@@ -407,134 +382,34 @@ func IsGenerationName(s string) bool {
 	return true
 }

-// GenerationsPath returns the path to a generation root directory.
-func GenerationsPath(root string) string {
-	return path.Join(root, "generations")
+// FormatIndex formats an index as an 8-character hex value.
+func FormatIndex(index int) string {
+	return fmt.Sprintf("%08x", index)
 }

-// GenerationPath returns the path to a generation's root directory.
-func GenerationPath(root, generation string) (string, error) {
-	dir := GenerationsPath(root)
-	if generation == "" {
-		return "", fmt.Errorf("generation required")
-	}
-	return path.Join(dir, generation), nil
-}
-
-// SnapshotsPath returns the path to a generation's snapshot directory.
-func SnapshotsPath(root, generation string) (string, error) {
-	dir, err := GenerationPath(root, generation)
+// ParseIndex parses a hex-formatted index into an integer.
+func ParseIndex(s string) (int, error) {
+	v, err := strconv.ParseUint(s, 16, 32)
 	if err != nil {
-		return "", err
+		return -1, fmt.Errorf("cannot parse index: %q", s)
 	}
-	return path.Join(dir, "snapshots"), nil
+	return int(v), nil
 }

-// SnapshotPath returns the path to an uncompressed snapshot file.
-func SnapshotPath(root, generation string, index int) (string, error) {
-	dir, err := SnapshotsPath(root, generation)
+// FormatOffset formats an offset as an 8-character hex value.
+func FormatOffset(offset int64) string {
+	return fmt.Sprintf("%08x", offset)
+}
+
+// ParseOffset parses a hex-formatted offset into an integer.
+func ParseOffset(s string) (int64, error) {
+	v, err := strconv.ParseInt(s, 16, 32)
 	if err != nil {
-		return "", err
+		return -1, fmt.Errorf("cannot parse index: %q", s)
 	}
-	return path.Join(dir, FormatSnapshotPath(index)), nil
+	return v, nil
 }

-// WALPath returns the path to a generation's WAL directory
-func WALPath(root, generation string) (string, error) {
-	dir, err := GenerationPath(root, generation)
-	if err != nil {
-		return "", err
-	}
-	return path.Join(dir, "wal"), nil
-}
-
-// WALSegmentPath returns the path to a WAL segment file.
-func WALSegmentPath(root, generation string, index int, offset int64) (string, error) {
-	dir, err := WALPath(root, generation)
-	if err != nil {
-		return "", err
-	}
-	return path.Join(dir, FormatWALSegmentPath(index, offset)), nil
-}
-
-// IsSnapshotPath returns true if s is a path to a snapshot file.
-func IsSnapshotPath(s string) bool {
-	return snapshotPathRegex.MatchString(s)
-}
-
-// ParseSnapshotPath returns the index for the snapshot.
-// Returns an error if the path is not a valid snapshot path.
-func ParseSnapshotPath(s string) (index int, err error) {
-	s = filepath.Base(s)
-
-	a := snapshotPathRegex.FindStringSubmatch(s)
-	if a == nil {
-		return 0, fmt.Errorf("invalid snapshot path: %s", s)
-	}
-
-	i64, _ := strconv.ParseUint(a[1], 16, 64)
-	return int(i64), nil
-}
-
-// FormatSnapshotPath formats a snapshot filename with a given index.
-func FormatSnapshotPath(index int) string {
-	assert(index >= 0, "snapshot index must be non-negative")
-	return fmt.Sprintf("%08x%s", index, SnapshotExt)
-}
-
-var snapshotPathRegex = regexp.MustCompile(`^([0-9a-f]{8})\.snapshot\.lz4$`)
-
-// IsWALPath returns true if s is a path to a WAL file.
-func IsWALPath(s string) bool {
-	return walPathRegex.MatchString(s)
-}
-
-// ParseWALPath returns the index for the WAL file.
-// Returns an error if the path is not a valid WAL path.
-func ParseWALPath(s string) (index int, err error) {
-	s = filepath.Base(s)
-
-	a := walPathRegex.FindStringSubmatch(s)
-	if a == nil {
-		return 0, fmt.Errorf("invalid wal path: %s", s)
-	}
-
-	i64, _ := strconv.ParseUint(a[1], 16, 64)
-	return int(i64), nil
-}
-
-// FormatWALPath formats a WAL filename with a given index.
-func FormatWALPath(index int) string {
-	assert(index >= 0, "wal index must be non-negative")
-	return fmt.Sprintf("%08x%s", index, WALExt)
-}
-
-var walPathRegex = regexp.MustCompile(`^([0-9a-f]{8})\.wal$`)
-
-// ParseWALSegmentPath returns the index & offset for the WAL segment file.
-// Returns an error if the path is not a valid wal segment path.
-func ParseWALSegmentPath(s string) (index int, offset int64, err error) {
-	s = filepath.Base(s)
-
-	a := walSegmentPathRegex.FindStringSubmatch(s)
-	if a == nil {
-		return 0, 0, fmt.Errorf("invalid wal segment path: %s", s)
-	}
-
-	i64, _ := strconv.ParseUint(a[1], 16, 64)
-	off64, _ := strconv.ParseUint(a[2], 16, 64)
-	return int(i64), int64(off64), nil
-}
-
-// FormatWALSegmentPath formats a WAL segment filename with a given index & offset.
-func FormatWALSegmentPath(index int, offset int64) string {
-	assert(index >= 0, "wal index must be non-negative")
-	assert(offset >= 0, "wal offset must be non-negative")
-	return fmt.Sprintf("%08x_%08x%s", index, offset, WALSegmentExt)
-}
-
-var walSegmentPathRegex = regexp.MustCompile(`^([0-9a-f]{8})(?:_([0-9a-f]{8}))\.wal\.lz4$`)
-
 // isHexChar returns true if ch is a lowercase hex character.
 func isHexChar(ch rune) bool {
 	return (ch >= '0' && ch <= '9') || (ch >= 'a' && ch <= 'f')
--- a/litestream_test.go
+++ b/litestream_test.go
@@ -40,104 +40,6 @@ func TestChecksum(t *testing.T) {
 	})
 }

-func TestGenerationsPath(t *testing.T) {
-	t.Run("OK", func(t *testing.T) {
-		if got, want := litestream.GenerationsPath("foo"), "foo/generations"; got != want {
-			t.Fatalf("GenerationsPath()=%v, want %v", got, want)
-		}
-	})
-	t.Run("NoPath", func(t *testing.T) {
-		if got, want := litestream.GenerationsPath(""), "generations"; got != want {
-			t.Fatalf("GenerationsPath()=%v, want %v", got, want)
-		}
-	})
-}
-
-func TestGenerationPath(t *testing.T) {
-	t.Run("OK", func(t *testing.T) {
-		if got, err := litestream.GenerationPath("foo", "0123456701234567"); err != nil {
-			t.Fatal(err)
-		} else if want := "foo/generations/0123456701234567"; got != want {
-			t.Fatalf("GenerationPath()=%v, want %v", got, want)
-		}
-	})
-	t.Run("ErrNoGeneration", func(t *testing.T) {
-		if _, err := litestream.GenerationPath("foo", ""); err == nil || err.Error() != `generation required` {
-			t.Fatalf("expected error: %v", err)
-		}
-	})
-}
-
-func TestSnapshotsPath(t *testing.T) {
-	t.Run("OK", func(t *testing.T) {
-		if got, err := litestream.SnapshotsPath("foo", "0123456701234567"); err != nil {
-			t.Fatal(err)
-		} else if want := "foo/generations/0123456701234567/snapshots"; got != want {
-			t.Fatalf("SnapshotsPath()=%v, want %v", got, want)
-		}
-	})
-	t.Run("ErrNoGeneration", func(t *testing.T) {
-		if _, err := litestream.SnapshotsPath("foo", ""); err == nil || err.Error() != `generation required` {
-			t.Fatalf("unexpected error: %v", err)
-		}
-	})
-}
-
-func TestSnapshotPath(t *testing.T) {
-	t.Run("OK", func(t *testing.T) {
-		if got, err := litestream.SnapshotPath("foo", "0123456701234567", 1000); err != nil {
-			t.Fatal(err)
-		} else if want := "foo/generations/0123456701234567/snapshots/000003e8.snapshot.lz4"; got != want {
-			t.Fatalf("SnapshotPath()=%v, want %v", got, want)
-		}
-	})
-	t.Run("ErrNoGeneration", func(t *testing.T) {
-		if _, err := litestream.SnapshotPath("foo", "", 1000); err == nil || err.Error() != `generation required` {
-			t.Fatalf("unexpected error: %v", err)
-		}
-	})
-}
-
-func TestWALPath(t *testing.T) {
-	t.Run("OK", func(t *testing.T) {
-		if got, err := litestream.WALPath("foo", "0123456701234567"); err != nil {
-			t.Fatal(err)
-		} else if want := "foo/generations/0123456701234567/wal"; got != want {
-			t.Fatalf("WALPath()=%v, want %v", got, want)
-		}
-	})
-	t.Run("ErrNoGeneration", func(t *testing.T) {
-		if _, err := litestream.WALPath("foo", ""); err == nil || err.Error() != `generation required` {
-			t.Fatalf("unexpected error: %v", err)
-		}
-	})
-}
-
-func TestWALSegmentPath(t *testing.T) {
-	t.Run("OK", func(t *testing.T) {
-		if got, err := litestream.WALSegmentPath("foo", "0123456701234567", 1000, 1001); err != nil {
-			t.Fatal(err)
-		} else if want := "foo/generations/0123456701234567/wal/000003e8_000003e9.wal.lz4"; got != want {
-			t.Fatalf("WALPath()=%v, want %v", got, want)
-		}
-	})
-	t.Run("ErrNoGeneration", func(t *testing.T) {
-		if _, err := litestream.WALSegmentPath("foo", "", 1000, 0); err == nil || err.Error() != `generation required` {
-			t.Fatalf("unexpected error: %v", err)
-		}
-	})
-}
-
-func TestFindMinSnapshotByGeneration(t *testing.T) {
-	infos := []litestream.SnapshotInfo{
-		{Generation: "29cf4bced74e92ab", Index: 0},
-		{Generation: "5dfeb4aa03232553", Index: 24},
-	}
-	if got, want := litestream.FindMinSnapshotByGeneration(infos, "29cf4bced74e92ab"), &infos[0]; got != want {
-		t.Fatalf("info=%#v, want %#v", got, want)
-	}
-}
-
 func MustDecodeHexString(s string) []byte {
 	b, err := hex.DecodeString(s)
 	if err != nil {
--- a/replica.go
+++ b/replica.go
@@ -15,7 +15,6 @@ import (
 	"sync"
 	"time"

-	"filippo.io/age"
 	"github.com/benbjohnson/litestream/internal"
 	"github.com/pierrec/lz4/v4"
 	"github.com/prometheus/client_golang/prometheus"
@@ -68,13 +67,6 @@ type Replica struct {
 	// If true, replica monitors database for changes automatically.
 	// Set to false if replica is being used synchronously (such as in tests).
 	MonitorEnabled bool
-
-	// Encryption identities and recipients
-	AgeIdentities []age.Identity
-	AgeRecipients []age.Recipient
-
-	// The logger to send logging messages to. Defaults to log.Default()
-	Logger *log.Logger
 }

 func NewReplica(db *DB, name string) *Replica {
@@ -87,7 +79,6 @@ func NewReplica(db *DB, name string) *Replica {
 		Retention:              DefaultRetention,
 		RetentionCheckInterval: DefaultRetentionCheckInterval,
 		MonitorEnabled:         true,
-		Logger:                 log.Default(),
 	}

 	return r
@@ -168,9 +159,6 @@ func (r *Replica) Sync(ctx context.Context) (err error) {

 	Tracef("%s(%s): replica sync: db.pos=%s", r.db.Path(), r.Name(), dpos)

-	// Create a new snapshot and update the current replica position if
-	// the generation on the database has changed.
-	if r.Pos().Generation != generation {
 	// Create snapshot if no snapshots exist for generation.
 	snapshotN, err := r.snapshotN(generation)
 	if err != nil {
@@ -181,8 +169,12 @@ func (r *Replica) Sync(ctx context.Context) (err error) {
 		} else if info.Generation != generation {
 			return fmt.Errorf("generation changed during snapshot, exiting sync")
 		}
+		snapshotN = 1
 	}
+	replicaSnapshotTotalGaugeVec.WithLabelValues(r.db.Path(), r.Name()).Set(float64(snapshotN))

+	// Determine position, if necessary.
+	if r.Pos().Generation != generation {
 		pos, err := r.calcPos(ctx, generation)
 		if err != nil {
 			return fmt.Errorf("cannot determine replica position: %s", err)
@@ -230,20 +222,8 @@ func (r *Replica) syncWAL(ctx context.Context) (err error) {
 		return err
 	})

-	var ew io.WriteCloser = pw
-
-	// Add encryption if we have recipients.
-	if len(r.AgeRecipients) > 0 {
-		var err error
-		ew, err = age.Encrypt(pw, r.AgeRecipients...)
-		if err != nil {
-			return err
-		}
-		defer ew.Close()
-	}
-
 	// Wrap writer to LZ4 compress.
-	zw := lz4.NewWriter(ew)
+	zw := lz4.NewWriter(pw)

 	// Track total WAL bytes written to replica client.
 	walBytesCounter := replicaWALBytesCounterVec.WithLabelValues(r.db.Path(), r.Name())
@@ -291,11 +271,9 @@ func (r *Replica) syncWAL(ctx context.Context) (err error) {
 		walBytesCounter.Add(float64(n))
 	}

-	// Flush LZ4 writer, encryption writer and close pipe.
+	// Flush LZ4 writer and close pipe.
 	if err := zw.Close(); err != nil {
 		return err
-	} else if err := ew.Close(); err != nil {
-		return err
 	} else if err := pw.Close(); err != nil {
 		return err
 	}
@@ -357,15 +335,6 @@ func (r *Replica) calcPos(ctx context.Context, generation string) (pos Pos, err
 	}
 	defer rd.Close()

-	if len(r.AgeIdentities) > 0 {
-		drd, err := age.Decrypt(rd, r.AgeIdentities...)
-		if err != nil {
-			return pos, err
-		}
-
-		rd = io.NopCloser(drd)
-	}
-
 	n, err := io.Copy(ioutil.Discard, lz4.NewReader(rd))
 	if err != nil {
 		return pos, err
@@ -463,10 +432,6 @@ func (r *Replica) Snapshot(ctx context.Context) (info SnapshotInfo, err error) {
 	r.muf.Lock()
 	defer r.muf.Unlock()

-	// Prevent checkpoints during snapshot.
-	r.db.BeginSnapshot()
-	defer r.db.EndSnapshot()
-
 	// Issue a passive checkpoint to flush any pages to disk before snapshotting.
 	if _, err := r.db.db.ExecContext(ctx, `PRAGMA wal_checkpoint(PASSIVE);`); err != nil {
 		return info, fmt.Errorf("pre-snapshot checkpoint: %w", err)
@@ -506,23 +471,7 @@ func (r *Replica) Snapshot(ctx context.Context) (info SnapshotInfo, err error) {
 	// Copy the database file to the LZ4 writer in a separate goroutine.
 	var g errgroup.Group
 	g.Go(func() error {
-		// We need to ensure the pipe is closed.
-		defer pw.Close()
-
-		var wc io.WriteCloser = pw
-
-		// Add encryption if we have recipients.
-		if len(r.AgeRecipients) > 0 {
-			var err error
-			wc, err = age.Encrypt(pw, r.AgeRecipients...)
-			if err != nil {
-				pw.CloseWithError(err)
-				return err
-			}
-			defer wc.Close()
-		}
-
-		zr := lz4.NewWriter(wc)
+		zr := lz4.NewWriter(pw)
 		defer zr.Close()

 		if _, err := io.Copy(zr, r.f); err != nil {
@@ -532,7 +481,7 @@ func (r *Replica) Snapshot(ctx context.Context) (info SnapshotInfo, err error) {
 			pw.CloseWithError(err)
 			return err
 		}
-		return wc.Close()
+		return pw.Close()
 	})

 	// Delegate write to client & wait for writer goroutine to finish.
@@ -542,7 +491,7 @@ func (r *Replica) Snapshot(ctx context.Context) (info SnapshotInfo, err error) {
 		return info, err
 	}

-	r.Logger.Printf("%s(%s): snapshot written %s/%08x", r.db.Path(), r.Name(), pos.Generation, pos.Index)
+	log.Printf("%s(%s): snapshot written %s/%08x", r.db.Path(), r.Name(), pos.Generation, pos.Index)

 	return info, nil
 }
@@ -610,7 +559,7 @@ func (r *Replica) deleteSnapshotsBeforeIndex(ctx context.Context, generation str
 		if err := r.Client.DeleteSnapshot(ctx, info.Generation, info.Index); err != nil {
 			return fmt.Errorf("delete snapshot %s/%08x: %w", info.Generation, info.Index, err)
 		}
-		r.Logger.Printf("%s(%s): snapshot deleted %s/%08x", r.db.Path(), r.Name(), generation, index)
+		log.Printf("%s(%s): snapshot deleted %s/%08x", r.db.Path(), r.Name(), generation, index)
 	}

 	return itr.Close()
@@ -642,7 +591,7 @@ func (r *Replica) deleteWALSegmentsBeforeIndex(ctx context.Context, generation s
 	if err := r.Client.DeleteWALSegments(ctx, a); err != nil {
 		return fmt.Errorf("delete wal segments: %w", err)
 	}
-	r.Logger.Printf("%s(%s): wal segmented deleted before %s/%08x: n=%d", r.db.Path(), r.Name(), generation, index, len(a))
+	log.Printf("%s(%s): wal segmented deleted before %s/%08x: n=%d", r.db.Path(), r.Name(), generation, index, len(a))

 	return nil
 }
@@ -679,7 +628,7 @@ func (r *Replica) monitor(ctx context.Context) {

 		// Synchronize the shadow wal into the replication directory.
 		if err := r.Sync(ctx); err != nil {
-			r.Logger.Printf("%s(%s): monitor error: %s", r.db.Path(), r.Name(), err)
+			log.Printf("%s(%s): monitor error: %s", r.db.Path(), r.Name(), err)
 			continue
 		}
 	}
@@ -707,7 +656,7 @@ func (r *Replica) retainer(ctx context.Context) {
 			return
 		case <-ticker.C:
 			if err := r.EnforceRetention(ctx); err != nil {
-				r.Logger.Printf("%s(%s): retainer error: %s", r.db.Path(), r.Name(), err)
+				log.Printf("%s(%s): retainer error: %s", r.db.Path(), r.Name(), err)
 				continue
 			}
 		}
@@ -729,7 +678,7 @@ func (r *Replica) snapshotter(ctx context.Context) {
 			return
 		case <-ticker.C:
 			if _, err := r.Snapshot(ctx); err != nil && err != ErrNoGeneration {
-				r.Logger.Printf("%s(%s): snapshotter error: %s", r.db.Path(), r.Name(), err)
+				log.Printf("%s(%s): snapshotter error: %s", r.db.Path(), r.Name(), err)
 				continue
 			}
 		}
@@ -757,7 +706,7 @@ func (r *Replica) validator(ctx context.Context) {
 			return
 		case <-ticker.C:
 			if err := r.Validate(ctx); err != nil {
-				r.Logger.Printf("%s(%s): validation error: %s", r.db.Path(), r.Name(), err)
+				log.Printf("%s(%s): validation error: %s", r.db.Path(), r.Name(), err)
 				continue
 			}
 		}
@@ -794,7 +743,7 @@ func (r *Replica) Validate(ctx context.Context) error {
 		ReplicaName: r.Name(),
 		Generation:  pos.Generation,
 		Index:       pos.Index - 1,
-		Logger:      r.Logger,
+		Logger:      log.New(os.Stderr, "", 0),
 	}); err != nil {
 		return fmt.Errorf("cannot restore: %w", err)
 	}
@@ -819,7 +768,7 @@ func (r *Replica) Validate(ctx context.Context) error {
 	if mismatch {
 		status = "mismatch"
 	}
-	r.Logger.Printf("%s(%s): validator: status=%s db=%016x replica=%016x pos=%s", db.Path(), r.Name(), status, chksum0, chksum1, pos)
+	log.Printf("%s(%s): validator: status=%s db=%016x replica=%016x pos=%s", db.Path(), r.Name(), status, chksum0, chksum1, pos)

 	// Validate checksums match.
 	if mismatch {
@@ -861,7 +810,7 @@ func (r *Replica) waitForReplica(ctx context.Context, pos Pos) error {
 		// Obtain current position of replica, check if past target position.
 		curr := r.Pos()
 		if curr.IsZero() {
-			r.Logger.Printf("%s(%s): validator: no replica position available", db.Path(), r.Name())
+			log.Printf("%s(%s): validator: no replica position available", db.Path(), r.Name())
 			continue
 		}

@@ -1016,7 +965,7 @@ func (r *Replica) Restore(ctx context.Context, opt RestoreOptions) (err error) {
 	// Ensure logger exists.
 	logger := opt.Logger
 	if logger == nil {
-		logger = r.Logger
+		logger = log.New(ioutil.Discard, "", 0)
 	}

 	logPrefix := r.Name()
@@ -1311,15 +1260,6 @@ func (r *Replica) restoreSnapshot(ctx context.Context, generation string, index
 	}
 	defer rd.Close()

-	if len(r.AgeIdentities) > 0 {
-		drd, err := age.Decrypt(rd, r.AgeIdentities...)
-		if err != nil {
-			return err
-		}
-
-		rd = io.NopCloser(drd)
-	}
-
 	if _, err := io.Copy(f, lz4.NewReader(rd)); err != nil {
 		return err
 	} else if err := f.Sync(); err != nil {
@@ -1346,16 +1286,6 @@ func (r *Replica) downloadWAL(ctx context.Context, generation string, index int,
 			return err
 		}
 		defer rd.Close()
-
-		if len(r.AgeIdentities) > 0 {
-			drd, err := age.Decrypt(rd, r.AgeIdentities...)
-			if err != nil {
-				return err
-			}
-
-			rd = io.NopCloser(drd)
-		}
-
 		readers = append(readers, lz4.NewReader(rd))
 	}

@@ -1377,6 +1307,13 @@ func (r *Replica) downloadWAL(ctx context.Context, generation string, index int,

 // Replica metrics.
 var (
+	replicaSnapshotTotalGaugeVec = promauto.NewGaugeVec(prometheus.GaugeOpts{
+		Namespace: "litestream",
+		Subsystem: "replica",
+		Name:      "snapshot_total",
+		Help:      "The current number of snapshots",
+	}, []string{"db", "name"})
+
 	replicaWALBytesCounterVec = promauto.NewCounterVec(prometheus.CounterOpts{
 		Namespace: "litestream",
 		Subsystem: "replica",
--- a/replica_client_test.go
+++ b/replica_client_test.go
@@ -177,7 +177,7 @@ func TestReplicaClient_Snapshots(t *testing.T) {
 		if err == nil {
 			err = itr.Close()
 		}
-		if err == nil || err.Error() != `cannot determine snapshots path: generation required` {
+		if err == nil || err.Error() != `generation required` {
 			t.Fatalf("unexpected error: %v", err)
 		}
 	})
@@ -204,7 +204,7 @@ func TestReplicaClient_WriteSnapshot(t *testing.T) {

 	RunWithReplicaClient(t, "ErrNoGeneration", func(t *testing.T, c litestream.ReplicaClient) {
 		t.Parallel()
-		if _, err := c.WriteSnapshot(context.Background(), "", 0, nil); err == nil || err.Error() != `cannot determine snapshot path: generation required` {
+		if _, err := c.WriteSnapshot(context.Background(), "", 0, nil); err == nil || err.Error() != `generation required` {
 			t.Fatalf("unexpected error: %v", err)
 		}
 	})
@@ -242,13 +242,13 @@ func TestReplicaClient_SnapshotReader(t *testing.T) {
 	RunWithReplicaClient(t, "ErrNoGeneration", func(t *testing.T, c litestream.ReplicaClient) {
 		t.Parallel()

-		if _, err := c.SnapshotReader(context.Background(), "", 1); err == nil || err.Error() != `cannot determine snapshot path: generation required` {
+		if _, err := c.SnapshotReader(context.Background(), "", 1); err == nil || err.Error() != `generation required` {
 			t.Fatalf("unexpected error: %v", err)
 		}
 	})
 }

-func TestReplicaClient_WALs(t *testing.T) {
+func TestReplicaClient_WALSegments(t *testing.T) {
 	RunWithReplicaClient(t, "OK", func(t *testing.T, c litestream.ReplicaClient) {
 		t.Parallel()

@@ -362,7 +362,7 @@ func TestReplicaClient_WALs(t *testing.T) {
 		if err == nil {
 			err = itr.Close()
 		}
-		if err == nil || err.Error() != `cannot determine wal path: generation required` {
+		if err == nil || err.Error() != `generation required` {
 			t.Fatalf("unexpected error: %v", err)
 		}
 	})
@@ -389,13 +389,13 @@ func TestReplicaClient_WriteWALSegment(t *testing.T) {

 	RunWithReplicaClient(t, "ErrNoGeneration", func(t *testing.T, c litestream.ReplicaClient) {
 		t.Parallel()
-		if _, err := c.WriteWALSegment(context.Background(), litestream.Pos{Generation: "", Index: 0, Offset: 0}, nil); err == nil || err.Error() != `cannot determine wal segment path: generation required` {
+		if _, err := c.WriteWALSegment(context.Background(), litestream.Pos{Generation: "", Index: 0, Offset: 0}, nil); err == nil || err.Error() != `generation required` {
 			t.Fatalf("unexpected error: %v", err)
 		}
 	})
 }

-func TestReplicaClient_WALReader(t *testing.T) {
+func TestReplicaClient_WALSegmentReader(t *testing.T) {

 	RunWithReplicaClient(t, "OK", func(t *testing.T, c litestream.ReplicaClient) {
 		t.Parallel()
@@ -451,7 +451,7 @@ func TestReplicaClient_DeleteWALSegments(t *testing.T) {

 	RunWithReplicaClient(t, "ErrNoGeneration", func(t *testing.T, c litestream.ReplicaClient) {
 		t.Parallel()
-		if err := c.DeleteWALSegments(context.Background(), []litestream.Pos{{}}); err == nil || err.Error() != `cannot determine wal segment path: generation required` {
+		if err := c.DeleteWALSegments(context.Background(), []litestream.Pos{{}}); err == nil || err.Error() != `generation required` {
 			t.Fatalf("unexpected error: %v", err)
 		}
 	})
--- a/s3/replica_client.go
+++ b/s3/replica_client.go
@@ -10,12 +10,14 @@ import (
 	"os"
 	"path"
 	"regexp"
+	"strings"
 	"sync"
 	"time"

 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/aws/awserr"
 	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/defaults"
 	"github.com/aws/aws-sdk-go/aws/session"
 	"github.com/aws/aws-sdk-go/service/s3"
 	"github.com/aws/aws-sdk-go/service/s3/s3manager"
@@ -92,7 +94,6 @@ func (c *ReplicaClient) Init(ctx context.Context) (err error) {
 	if region != "" {
 		config.Region = aws.String(region)
 	}
-
 	sess, err := session.NewSession(config)
 	if err != nil {
 		return fmt.Errorf("cannot create aws session: %w", err)
@@ -105,8 +106,7 @@ func (c *ReplicaClient) Init(ctx context.Context) (err error) {
 // config returns the AWS configuration. Uses the default credential chain
 // unless a key/secret are explicitly set.
 func (c *ReplicaClient) config() *aws.Config {
-	config := &aws.Config{}
-
+	config := defaults.Get().Config
 	if c.AccessKeyID != "" || c.SecretAccessKey != "" {
 		config.Credentials = credentials.NewStaticCredentials(c.AccessKeyID, c.SecretAccessKey, "")
 	}
@@ -155,7 +155,7 @@ func (c *ReplicaClient) Generations(ctx context.Context) ([]string, error) {
 	var generations []string
 	if err := c.s3.ListObjectsPagesWithContext(ctx, &s3.ListObjectsInput{
 		Bucket:    aws.String(c.Bucket),
-		Prefix:    aws.String(litestream.GenerationsPath(c.Path) + "/"),
+		Prefix:    aws.String(path.Join(c.Path, "generations") + "/"),
 		Delimiter: aws.String("/"),
 	}, func(page *s3.ListObjectsOutput, lastPage bool) bool {
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()
@@ -179,18 +179,15 @@ func (c *ReplicaClient) Generations(ctx context.Context) ([]string, error) {
 func (c *ReplicaClient) DeleteGeneration(ctx context.Context, generation string) error {
 	if err := c.Init(ctx); err != nil {
 		return err
-	}
-
-	dir, err := litestream.GenerationPath(c.Path, generation)
-	if err != nil {
-		return fmt.Errorf("cannot determine generation path: %w", err)
+	} else if generation == "" {
+		return fmt.Errorf("generation required")
 	}

 	// Collect all files for the generation.
 	var objIDs []*s3.ObjectIdentifier
 	if err := c.s3.ListObjectsPagesWithContext(ctx, &s3.ListObjectsInput{
 		Bucket: aws.String(c.Bucket),
-		Prefix: aws.String(dir),
+		Prefix: aws.String(path.Join(c.Path, "generations", generation)),
 	}, func(page *s3.ListObjectsOutput, lastPage bool) bool {
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()

@@ -209,14 +206,10 @@ func (c *ReplicaClient) DeleteGeneration(ctx context.Context, generation string)
 			n = len(objIDs)
 		}

-		out, err := c.s3.DeleteObjectsWithContext(ctx, &s3.DeleteObjectsInput{
+		if _, err := c.s3.DeleteObjectsWithContext(ctx, &s3.DeleteObjectsInput{
 			Bucket: aws.String(c.Bucket),
 			Delete: &s3.Delete{Objects: objIDs[:n], Quiet: aws.Bool(true)},
-		})
-		if err != nil {
-			return err
-		}
-		if err := deleteOutputError(out); err != nil {
+		}); err != nil {
 			return err
 		}
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "DELETE").Inc()
@@ -241,12 +234,11 @@ func (c *ReplicaClient) Snapshots(ctx context.Context, generation string) (lites
 func (c *ReplicaClient) WriteSnapshot(ctx context.Context, generation string, index int, rd io.Reader) (info litestream.SnapshotInfo, err error) {
 	if err := c.Init(ctx); err != nil {
 		return info, err
+	} else if generation == "" {
+		return info, fmt.Errorf("generation required")
 	}

-	key, err := litestream.SnapshotPath(c.Path, generation, index)
-	if err != nil {
-		return info, fmt.Errorf("cannot determine snapshot path: %w", err)
-	}
+	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")
 	startTime := time.Now()

 	rc := internal.NewReadCounter(rd)
@@ -275,12 +267,11 @@ func (c *ReplicaClient) WriteSnapshot(ctx context.Context, generation string, in
 func (c *ReplicaClient) SnapshotReader(ctx context.Context, generation string, index int) (io.ReadCloser, error) {
 	if err := c.Init(ctx); err != nil {
 		return nil, err
+	} else if generation == "" {
+		return nil, fmt.Errorf("generation required")
 	}

-	key, err := litestream.SnapshotPath(c.Path, generation, index)
-	if err != nil {
-		return nil, fmt.Errorf("cannot determine snapshot path: %w", err)
-	}
+	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")

 	out, err := c.s3.GetObjectWithContext(ctx, &s3.GetObjectInput{
 		Bucket: aws.String(c.Bucket),
@@ -301,21 +292,16 @@ func (c *ReplicaClient) SnapshotReader(ctx context.Context, generation string, i
 func (c *ReplicaClient) DeleteSnapshot(ctx context.Context, generation string, index int) error {
 	if err := c.Init(ctx); err != nil {
 		return err
+	} else if generation == "" {
+		return fmt.Errorf("generation required")
 	}

-	key, err := litestream.SnapshotPath(c.Path, generation, index)
-	if err != nil {
-		return fmt.Errorf("cannot determine snapshot path: %w", err)
-	}
+	key := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")

-	out, err := c.s3.DeleteObjectsWithContext(ctx, &s3.DeleteObjectsInput{
+	if _, err := c.s3.DeleteObjectsWithContext(ctx, &s3.DeleteObjectsInput{
 		Bucket: aws.String(c.Bucket),
 		Delete: &s3.Delete{Objects: []*s3.ObjectIdentifier{{Key: &key}}, Quiet: aws.Bool(true)},
-	})
-	if err != nil {
-		return err
-	}
-	if err := deleteOutputError(out); err != nil {
+	}); err != nil {
 		return err
 	}

@@ -335,12 +321,11 @@ func (c *ReplicaClient) WALSegments(ctx context.Context, generation string) (lit
 func (c *ReplicaClient) WriteWALSegment(ctx context.Context, pos litestream.Pos, rd io.Reader) (info litestream.WALSegmentInfo, err error) {
 	if err := c.Init(ctx); err != nil {
 		return info, err
+	} else if pos.Generation == "" {
+		return info, fmt.Errorf("generation required")
 	}

-	key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
-	if err != nil {
-		return info, fmt.Errorf("cannot determine wal segment path: %w", err)
-	}
+	key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
 	startTime := time.Now()

 	rc := internal.NewReadCounter(rd)
@@ -369,12 +354,11 @@ func (c *ReplicaClient) WriteWALSegment(ctx context.Context, pos litestream.Pos,
 func (c *ReplicaClient) WALSegmentReader(ctx context.Context, pos litestream.Pos) (io.ReadCloser, error) {
 	if err := c.Init(ctx); err != nil {
 		return nil, err
+	} else if pos.Generation == "" {
+		return nil, fmt.Errorf("generation required")
 	}

-	key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
-	if err != nil {
-		return nil, fmt.Errorf("cannot determine wal segment path: %w", err)
-	}
+	key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")

 	out, err := c.s3.GetObjectWithContext(ctx, &s3.GetObjectInput{
 		Bucket: aws.String(c.Bucket),
@@ -406,24 +390,21 @@ func (c *ReplicaClient) DeleteWALSegments(ctx context.Context, a []litestream.Po

 		// Generate a batch of object IDs for deleting the WAL segments.
 		for i, pos := range a[:n] {
-			key, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
-			if err != nil {
-				return fmt.Errorf("cannot determine wal segment path: %w", err)
+			if pos.Generation == "" {
+				return fmt.Errorf("generation required")
 			}
+			key := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
 			objIDs[i] = &s3.ObjectIdentifier{Key: &key}
 		}

 		// Delete S3 objects in bulk.
-		out, err := c.s3.DeleteObjectsWithContext(ctx, &s3.DeleteObjectsInput{
+		if _, err := c.s3.DeleteObjectsWithContext(ctx, &s3.DeleteObjectsInput{
 			Bucket: aws.String(c.Bucket),
 			Delete: &s3.Delete{Objects: objIDs[:n], Quiet: aws.Bool(true)},
-		})
-		if err != nil {
-			return err
-		}
-		if err := deleteOutputError(out); err != nil {
+		}); err != nil {
 			return err
 		}
+
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "DELETE").Inc()

 		a = a[n:]
@@ -466,14 +447,10 @@ func (c *ReplicaClient) DeleteAll(ctx context.Context) error {
 			n = len(objIDs)
 		}

-		out, err := c.s3.DeleteObjectsWithContext(ctx, &s3.DeleteObjectsInput{
+		if _, err := c.s3.DeleteObjectsWithContext(ctx, &s3.DeleteObjectsInput{
 			Bucket: aws.String(c.Bucket),
 			Delete: &s3.Delete{Objects: objIDs[:n], Quiet: aws.Bool(true)},
-		})
-		if err != nil {
-			return err
-		}
-		if err := deleteOutputError(out); err != nil {
+		}); err != nil {
 			return err
 		}
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "DELETE").Inc()
@@ -514,11 +491,12 @@ func newSnapshotIterator(ctx context.Context, client *ReplicaClient, generation
 func (itr *snapshotIterator) fetch() error {
 	defer close(itr.ch)

-	dir, err := litestream.SnapshotsPath(itr.client.Path, itr.generation)
-	if err != nil {
-		return fmt.Errorf("cannot determine snapshots path: %w", err)
+	if itr.generation == "" {
+		return fmt.Errorf("generation required")
 	}

+	dir := path.Join(itr.client.Path, "generations", itr.generation, "snapshots")
+
 	return itr.client.s3.ListObjectsPagesWithContext(itr.ctx, &s3.ListObjectsInput{
 		Bucket:    aws.String(itr.client.Bucket),
 		Prefix:    aws.String(dir + "/"),
@@ -527,8 +505,7 @@ func (itr *snapshotIterator) fetch() error {
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()

 		for _, obj := range page.Contents {
-			key := path.Base(*obj.Key)
-			index, err := litestream.ParseSnapshotPath(key)
+			index, err := internal.ParseSnapshotPath(path.Base(*obj.Key))
 			if err != nil {
 				continue
 			}
@@ -617,21 +594,20 @@ func newWALSegmentIterator(ctx context.Context, client *ReplicaClient, generatio
 func (itr *walSegmentIterator) fetch() error {
 	defer close(itr.ch)

-	dir, err := litestream.WALPath(itr.client.Path, itr.generation)
-	if err != nil {
-		return fmt.Errorf("cannot determine wal path: %w", err)
+	if itr.generation == "" {
+		return fmt.Errorf("generation required")
 	}

+	prefix := path.Join(itr.client.Path, "generations", itr.generation, "wal") + "/"
+
 	return itr.client.s3.ListObjectsPagesWithContext(itr.ctx, &s3.ListObjectsInput{
 		Bucket: aws.String(itr.client.Bucket),
-		Prefix:    aws.String(dir + "/"),
-		Delimiter: aws.String("/"),
+		Prefix: aws.String(prefix),
 	}, func(page *s3.ListObjectsOutput, lastPage bool) bool {
 		internal.OperationTotalCounterVec.WithLabelValues(ReplicaClientType, "LIST").Inc()

 		for _, obj := range page.Contents {
-			key := path.Base(*obj.Key)
-			index, offset, err := litestream.ParseWALSegmentPath(key)
+			index, offset, err := internal.ParseWALSegmentPath(strings.TrimPrefix(*obj.Key, prefix))
 			if err != nil {
 				continue
 			}
@@ -753,15 +729,3 @@ func isNotExists(err error) bool {
 		return false
 	}
 }
-
-func deleteOutputError(out *s3.DeleteObjectsOutput) error {
-	switch len(out.Errors) {
-	case 0:
-		return nil
-	case 1:
-		return fmt.Errorf("deleting object %s: %s - %s", *out.Errors[0].Key, *out.Errors[0].Code, *out.Errors[0].Message)
-	default:
-		return fmt.Errorf("%d errors occured deleting objects, %s: %s - (%s (and %d others)",
-			len(out.Errors), *out.Errors[0].Key, *out.Errors[0].Code, *out.Errors[0].Message, len(out.Errors)-1)
-	}
-}
--- a/sftp/replica_client.go
+++ b/sftp/replica_client.go
@@ -9,6 +9,7 @@ import (
 	"os"
 	"path"
 	"sort"
+	"strings"
 	"sync"
 	"time"

@@ -121,7 +122,7 @@ func (c *ReplicaClient) Generations(ctx context.Context) (_ []string, err error)
 		return nil, err
 	}

-	fis, err := sftpClient.ReadDir(litestream.GenerationsPath(c.Path))
+	fis, err := sftpClient.ReadDir(path.Join(c.Path, "generations"))
 	if os.IsNotExist(err) {
 		return nil, nil
 	} else if err != nil {
@@ -153,12 +154,11 @@ func (c *ReplicaClient) DeleteGeneration(ctx context.Context, generation string)
 	sftpClient, err := c.Init(ctx)
 	if err != nil {
 		return err
+	} else if generation == "" {
+		return fmt.Errorf("generation required")
 	}

-	dir, err := litestream.GenerationPath(c.Path, generation)
-	if err != nil {
-		return fmt.Errorf("cannot determine generation path: %w", err)
-	}
+	dir := path.Join(c.Path, "generations", generation)

 	var dirs []string
 	walker := sftpClient.Walk(dir)
@@ -198,12 +198,11 @@ func (c *ReplicaClient) Snapshots(ctx context.Context, generation string) (_ lit
 	sftpClient, err := c.Init(ctx)
 	if err != nil {
 		return nil, err
+	} else if generation == "" {
+		return nil, fmt.Errorf("generation required")
 	}

-	dir, err := litestream.SnapshotsPath(c.Path, generation)
-	if err != nil {
-		return nil, fmt.Errorf("cannot determine snapshots path: %w", err)
-	}
+	dir := path.Join(c.Path, "generations", generation, "snapshots")

 	fis, err := sftpClient.ReadDir(dir)
 	if os.IsNotExist(err) {
@@ -216,7 +215,7 @@ func (c *ReplicaClient) Snapshots(ctx context.Context, generation string) (_ lit
 	infos := make([]litestream.SnapshotInfo, 0, len(fis))
 	for _, fi := range fis {
 		// Parse index from filename.
-		index, err := litestream.ParseSnapshotPath(path.Base(fi.Name()))
+		index, err := internal.ParseSnapshotPath(path.Base(fi.Name()))
 		if err != nil {
 			continue
 		}
@@ -241,12 +240,11 @@ func (c *ReplicaClient) WriteSnapshot(ctx context.Context, generation string, in
 	sftpClient, err := c.Init(ctx)
 	if err != nil {
 		return info, err
+	} else if generation == "" {
+		return info, fmt.Errorf("generation required")
 	}

-	filename, err := litestream.SnapshotPath(c.Path, generation, index)
-	if err != nil {
-		return info, fmt.Errorf("cannot determine snapshot path: %w", err)
-	}
+	filename := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")
 	startTime := time.Now()

 	if err := sftpClient.MkdirAll(path.Dir(filename)); err != nil {
@@ -286,12 +284,11 @@ func (c *ReplicaClient) SnapshotReader(ctx context.Context, generation string, i
 	sftpClient, err := c.Init(ctx)
 	if err != nil {
 		return nil, err
+	} else if generation == "" {
+		return nil, fmt.Errorf("generation required")
 	}

-	filename, err := litestream.SnapshotPath(c.Path, generation, index)
-	if err != nil {
-		return nil, fmt.Errorf("cannot determine snapshot path: %w", err)
-	}
+	filename := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")

 	f, err := sftpClient.Open(filename)
 	if err != nil {
@@ -310,12 +307,11 @@ func (c *ReplicaClient) DeleteSnapshot(ctx context.Context, generation string, i
 	sftpClient, err := c.Init(ctx)
 	if err != nil {
 		return err
+	} else if generation == "" {
+		return fmt.Errorf("generation required")
 	}

-	filename, err := litestream.SnapshotPath(c.Path, generation, index)
-	if err != nil {
-		return fmt.Errorf("cannot determine snapshot path: %w", err)
-	}
+	filename := path.Join(c.Path, "generations", generation, "snapshots", litestream.FormatIndex(index)+".snapshot.lz4")

 	if err := sftpClient.Remove(filename); err != nil && !os.IsNotExist(err) {
 		return fmt.Errorf("cannot delete snapshot %q: %w", filename, err)
@@ -332,12 +328,11 @@ func (c *ReplicaClient) WALSegments(ctx context.Context, generation string) (_ l
 	sftpClient, err := c.Init(ctx)
 	if err != nil {
 		return nil, err
+	} else if generation == "" {
+		return nil, fmt.Errorf("generation required")
 	}

-	dir, err := litestream.WALPath(c.Path, generation)
-	if err != nil {
-		return nil, fmt.Errorf("cannot determine wal path: %w", err)
-	}
+	dir := path.Join(c.Path, "generations", generation, "wal")

 	fis, err := sftpClient.ReadDir(dir)
 	if os.IsNotExist(err) {
@@ -347,25 +342,18 @@ func (c *ReplicaClient) WALSegments(ctx context.Context, generation string) (_ l
 	}

 	// Iterate over every file and convert to metadata.
-	infos := make([]litestream.WALSegmentInfo, 0, len(fis))
+	indexes := make([]int, 0, len(fis))
 	for _, fi := range fis {
-		index, offset, err := litestream.ParseWALSegmentPath(path.Base(fi.Name()))
-		if err != nil {
+		index, err := litestream.ParseIndex(fi.Name())
+		if err != nil || !fi.IsDir() {
 			continue
 		}
-
-		infos = append(infos, litestream.WALSegmentInfo{
-			Generation: generation,
-			Index:      index,
-			Offset:     offset,
-			Size:       fi.Size(),
-			CreatedAt:  fi.ModTime().UTC(),
-		})
+		indexes = append(indexes, index)
 	}

-	sort.Sort(litestream.WALSegmentInfoSlice(infos))
+	sort.Ints(indexes)

-	return litestream.NewWALSegmentInfoSliceIterator(infos), nil
+	return newWALSegmentIterator(ctx, c, dir, generation, indexes), nil
 }

 // WriteWALSegment writes LZ4 compressed data from rd into a file on disk.
@@ -375,12 +363,11 @@ func (c *ReplicaClient) WriteWALSegment(ctx context.Context, pos litestream.Pos,
 	sftpClient, err := c.Init(ctx)
 	if err != nil {
 		return info, err
+	} else if pos.Generation == "" {
+		return info, fmt.Errorf("generation required")
 	}

-	filename, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
-	if err != nil {
-		return info, fmt.Errorf("cannot determine wal segment path: %w", err)
-	}
+	filename := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
 	startTime := time.Now()

 	if err := sftpClient.MkdirAll(path.Dir(filename)); err != nil {
@@ -420,12 +407,11 @@ func (c *ReplicaClient) WALSegmentReader(ctx context.Context, pos litestream.Pos
 	sftpClient, err := c.Init(ctx)
 	if err != nil {
 		return nil, err
+	} else if pos.Generation == "" {
+		return nil, fmt.Errorf("generation required")
 	}

-	filename, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
-	if err != nil {
-		return nil, fmt.Errorf("cannot determine wal segment path: %w", err)
-	}
+	filename := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")

 	f, err := sftpClient.Open(filename)
 	if err != nil {
@@ -447,11 +433,12 @@ func (c *ReplicaClient) DeleteWALSegments(ctx context.Context, a []litestream.Po
 	}

 	for _, pos := range a {
-		filename, err := litestream.WALSegmentPath(c.Path, pos.Generation, pos.Index, pos.Offset)
-		if err != nil {
-			return fmt.Errorf("cannot determine wal segment path: %w", err)
+		if pos.Generation == "" {
+			return fmt.Errorf("generation required")
 		}

+		filename := path.Join(c.Path, "generations", pos.Generation, "wal", litestream.FormatIndex(pos.Index), litestream.FormatOffset(pos.Offset)+".wal.lz4")
+
 		if err := sftpClient.Remove(filename); err != nil && !os.IsNotExist(err) {
 			return fmt.Errorf("cannot delete wal segment %q: %w", filename, err)
 		}
@@ -470,7 +457,7 @@ func (c *ReplicaClient) Cleanup(ctx context.Context) (err error) {
 		return err
 	}

-	if err := sftpClient.RemoveDirectory(litestream.GenerationsPath(c.Path)); err != nil && !os.IsNotExist(err) {
+	if err := sftpClient.RemoveDirectory(path.Join(c.Path, "generations")); err != nil && !os.IsNotExist(err) {
 		return fmt.Errorf("cannot delete generations path: %w", err)
 	} else if err := sftpClient.RemoveDirectory(c.Path); err != nil && !os.IsNotExist(err) {
 		return fmt.Errorf("cannot delete path: %w", err)
@@ -493,3 +480,101 @@ func (c *ReplicaClient) resetOnConnError(err error) {
 		c.sshClient = nil
 	}
 }
+
+type walSegmentIterator struct {
+	ctx        context.Context
+	client     *ReplicaClient
+	dir        string
+	generation string
+	indexes    []int
+
+	infos []litestream.WALSegmentInfo
+	err   error
+}
+
+func newWALSegmentIterator(ctx context.Context, client *ReplicaClient, dir, generation string, indexes []int) *walSegmentIterator {
+	return &walSegmentIterator{
+		ctx:        ctx,
+		client:     client,
+		dir:        dir,
+		generation: generation,
+		indexes:    indexes,
+	}
+}
+
+func (itr *walSegmentIterator) Close() (err error) {
+	return itr.err
+}
+
+func (itr *walSegmentIterator) Next() bool {
+	sftpClient, err := itr.client.Init(itr.ctx)
+	if err != nil {
+		itr.err = err
+		return false
+	}
+
+	// Exit if an error has already occurred.
+	if itr.err != nil {
+		return false
+	}
+
+	for {
+		// Move to the next segment in cache, if available.
+		if len(itr.infos) > 1 {
+			itr.infos = itr.infos[1:]
+			return true
+		}
+		itr.infos = itr.infos[:0] // otherwise clear infos
+
+		// Move to the next index unless this is the first time initializing.
+		if itr.infos != nil && len(itr.indexes) > 0 {
+			itr.indexes = itr.indexes[1:]
+		}
+
+		// If no indexes remain, stop iteration.
+		if len(itr.indexes) == 0 {
+			return false
+		}
+
+		// Read segments into a cache for the current index.
+		index := itr.indexes[0]
+		fis, err := sftpClient.ReadDir(path.Join(itr.dir, litestream.FormatIndex(index)))
+		if err != nil {
+			itr.err = err
+			return false
+		}
+
+		for _, fi := range fis {
+			filename := path.Base(fi.Name())
+			if fi.IsDir() {
+				continue
+			}
+
+			offset, err := litestream.ParseOffset(strings.TrimSuffix(filename, ".wal.lz4"))
+			if err != nil {
+				continue
+			}
+
+			itr.infos = append(itr.infos, litestream.WALSegmentInfo{
+				Generation: itr.generation,
+				Index:      index,
+				Offset:     offset,
+				Size:       fi.Size(),
+				CreatedAt:  fi.ModTime().UTC(),
+			})
+		}
+
+		if len(itr.infos) > 0 {
+			return true
+		}
+	}
+}
+
+func (itr *walSegmentIterator) Err() error { return itr.err }
+
+func (itr *walSegmentIterator) WALSegment() litestream.WALSegmentInfo {
+	if len(itr.infos) == 0 {
+		return litestream.WALSegmentInfo{}
+	}
+	return itr.infos[0]
+}