hashicorp/nomad · warning

alloc entry not found

Error message

alloc entry not found

What it means

While upgrading one alloc's bucket, the code scans task buckets for an entry representing the alloc itself (alloc entry). If none was found, the allocation's state is considered corrupted, the alloc is abandoned with this error, and (per the caller) the alloc's state is dropped rather than upgraded.

Source

Thrown at client/state/upgrade.go:193

					"key", string(k), "value_bytes", len(v),
				)

				if err := cur.Delete(); err != nil {
					return err
				}

				continue
			}

			// Nested buckets are tasks
			taskBuckets = append(taskBuckets, k)
		}
	}

	// If the alloc entry was not found, abandon this allocation as the
	// state has been corrupted.
	if !allocFound {
		return fmt.Errorf("alloc entry not found")
	}

	// Upgrade tasks
	for _, taskBucket := range taskBuckets {
		taskName := string(taskBucket)
		taskLogger := logger.With("task_name", taskName)

		taskBkt := bkt.Bucket(taskBucket)
		if taskBkt == nil {
			// This should never happen as we just read the bucket.
			return fmt.Errorf("unexpected bucket missing %q", taskName)
		}

		oldState, err := upgradeTaskBucket(taskLogger, taskBkt)
		if err != nil {
			taskLogger.Warn("dropping invalid task due to error while upgrading state",
				"error", err,
			)

View on GitHub (pinned to 482b49bf1a)

Solutions

1. This is expected to be tolerated: the caller logs 'dropping invalid allocation' and deletes the bucket — confirm via agent logs which alloc was dropped.
2. Reconcile state: the client re-syncs allocs from the Nomad servers, so the dropped alloc re-registers.
3. If many allocs are dropped, restore state.db from backup or wipe state and let the client rebuild.
4. Avoid killing the agent mid-write (use graceful shutdown).

Example fix

// before
alloc a1b2 state corrupt -> alloc entry not found, alloc dropped
// after
# verify server-side alloc is running
nomad status <alloc-id>  # client re-syncs; no action usually needed

if err := upgradeAllocBucket(logger, tx, bkt, allocID); err != nil {
    if err.Error() == "alloc entry not found" {
        allocLogger.Warn("dropping corrupted alloc; client will re-sync from servers", "error", err)
        if derr := allocationsBucket.DeleteBucket([]byte(allocID)); derr != nil {
            return derr
        }
        continue
    }
    return err
}

When it happens

Trigger: upgradeAllocBucket iterates all buckets/keys under the alloc bucket and never finds the alloc entry — e.g. the alloc bucket contains only task buckets or partial writes from a crash left the alloc record missing.

Common situations: Client crash mid-write to state.db leaving a partially written alloc bucket; restore from an inconsistent backup; manual tampering with state.db.

Related errors

• unexpected bucket missing %q
• error deleting invalid allocation state: %v
• error backing up state db: %v
• error deleting unexpected key %q: %v
• missing AllocID

AI-assisted analysis of hashicorp/nomad@482b49bf1a (2026-09-04). Data as JSON: /api/errors/b5cc2537ce75512b. Report an issue: GitHub.