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Ben Johnson 3f0ec9fa9f Refactor Restore()

This commit refactors out the complexity of downloading ordered WAL
files in parallel to a type called `WALDownloader`. This makes it
easier to test the restore separately from the download.

2022-01-04 15:03:59 -07:00

generations/0000000000000000

Refactor Restore()

2022-01-04 15:03:59 -07:00

00000002.db

Refactor Restore()

2022-01-04 15:03:59 -07:00

README

Refactor Restore()

2022-01-04 15:03:59 -07:00

README

To reproduce this testdata, run sqlite3 and execute:

	PRAGMA journal_mode = WAL;
	CREATE TABLE t (x);
	INSERT INTO t (x) VALUES (1);
	INSERT INTO t (x) VALUES (2);

	sl3 split -o generations/0000000000000000/wal/00000000 db-wal
	cp db generations/0000000000000000/snapshots/00000000.snapshot
	lz4 -c --rm generations/0000000000000000/snapshots/00000000.snapshot


Then execute:

	PRAGMA wal_checkpoint(TRUNCATE);
	INSERT INTO t (x) VALUES (3);

	sl3 split -o generations/0000000000000000/wal/00000001 db-wal


Then execute:

	PRAGMA wal_checkpoint(TRUNCATE);
	INSERT INTO t (x) VALUES (4);
	INSERT INTO t (x) VALUES (5);

	sl3 split -o generations/0000000000000000/wal/00000002 db-wal


Finally, obtain the final snapshot:

	PRAGMA wal_checkpoint(TRUNCATE);

	cp db 00000002.db
	rm db*