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Add wal validation debug information on error

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This commit adds the WAL header and shadow path to "wal header mismatch"
errors to help debug issues. The mismatch seems to happen more often
than I would expect on restart. This error doesn't cause any corruption;
it simply causes a generation to restart which requires a snapshot.
This commit is contained in:
Ben Johnson
2021-03-07 07:48:43 -07:00
parent 49f47ea87f
commit 0bd1b13b94
1 changed files with 2 additions and 2 deletions
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4
db.go
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@@ -462,7 +462,7 @@ func (db *DB) init() (err error) {
// If we have an existing shadow WAL, ensure the headers match. // If we have an existing shadow WAL, ensure the headers match.
if err := db.verifyHeadersMatch(); err != nil { if err := db.verifyHeadersMatch(); err != nil {
log.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) { if err := os.Remove(db.GenerationNamePath()); err != nil && !os.IsNotExist(err) {
return fmt.Errorf("remove generation name: %w", err) return fmt.Errorf("remove generation name: %w", err)
} }
@@ -512,7 +512,7 @@ func (db *DB) verifyHeadersMatch() error {
} }
if !bytes.Equal(hdr0, hdr1) { if !bytes.Equal(hdr0, hdr1) {
return fmt.Errorf("wal header mismatch") return fmt.Errorf("wal header mismatch %x <> %x on %s", hdr0, hdr1, shadowWALPath)
} }
return nil return nil
} }