hashicorp/nomad · error

failed to get source uint64 key %s: %w

Error message

failed to get source uint64 key %s: %w

What it means

Fires in verifyMigration when reading a raft stable-store key (CurrentTerm or LastVoteTerm) from the source store fails; consensus metadata could not be compared, so migration verification aborts.

Source

Thrown at helper/raftutil/migrate.go:285

	dstLast, err := dst.LastIndex()
	if err != nil {
		return fmt.Errorf("failed to get destination last index: %w", err)
	}

	if srcFirst != dstFirst {
		return fmt.Errorf("first index mismatch: source=%d, destination=%d", srcFirst, dstFirst)
	}

	if srcLast != dstLast {
		return fmt.Errorf("last index mismatch: source=%d, destination=%d", srcLast, dstLast)
	}

	// Verify stable store uint64 keys.
	uint64Keys := []string{"CurrentTerm", "LastVoteTerm"}
	for _, key := range uint64Keys {
		srcVal, err := src.GetUint64([]byte(key))
		if err != nil {
			return fmt.Errorf("failed to get source uint64 key %s: %w", key, err)
		}

		dstVal, err := dst.GetUint64([]byte(key))
		if err != nil {
			return fmt.Errorf("failed to get destination uint64 key %s: %w", key, err)
		}

		if srcVal != dstVal {
			return fmt.Errorf("stable key %s mismatch: source=%d, destination=%d", key, srcVal, dstVal)
		}
	}

	// Verify stable store byte keys.
	byteKeys := []string{"LastVoteCand"}
	for _, key := range byteKeys {
		srcVal, err := src.Get([]byte(key))
		if err != nil {
			srcVal = nil

View on GitHub (pinned to 482b49bf1a)

Solutions

1. Check the source store for corruption or file locking issues
2. Re-run the migration once the source is readable
3. Restore from snapshot if the stable store is damaged

When it happens

Trigger: Thrown at helper/raftutil/migrate.go:285 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of hashicorp/nomad@482b49bf1a (2026-09-04). Data as JSON: /api/errors/f9983871b1d80c66. Report an issue: GitHub.