internal leveldb error while retrieving data from db iterato

Error message

internal leveldb error while retrieving data from db iterator

What it means

fullDBScanner.Next wraps any error reported by the underlying goleveldb iterator with this message. It signals that iteration over the state DB failed at the storage layer (corruption, I/O failure, snapshot issues), not a logic error in the ledger.

Source

Thrown at core/ledger/kvledger/txmgmt/statedb/stateleveldb/stateleveldb.go:397

		}

		versionedVal, err := decodeValue(s.dbItr.Value())
		if err != nil {
			return nil, err
		}

		switch {
		case !s.toSkip(ns):
			return &statedb.VersionedKV{
				CompositeKey:   compositeKey,
				VersionedValue: versionedVal,
			}, nil
		default:
			s.dbItr.Seek(dataKeyStarterForNextNamespace(ns))
			s.dbItr.Prev()
		}
	}
	return nil, errors.Wrap(s.dbItr.Error(), "internal leveldb error while retrieving data from db iterator")
}

func (s *fullDBScanner) Close() {
	if s == nil {
		return
	}
	s.dbItr.Release()
}

View on GitHub (pinned to 2736b63f8f)

Solutions

Inspect the wrapped error (errors.Wrap cause) in peer logs to identify the underlying goleveldb failure.
Check disk space, permissions, and filesystem health on the ledger data directory.
Stop the peer, restore the state DB from a snapshot/backup, or delete and rebuild the state DB from the blockchain (rebuild).
If corruption is confirmed, use peer node rebuild-dbs (or remove statedb/leveldb data) and restart the peer to re-generate state.
Run with a consistent backup procedure: always stop the peer before copying LevelDB files.

Defensive patterns

Strategy: retry

Try / catch

itr, err := stub.GetStateByRange(start, end)
if err != nil { return err }
for itr.HasNext() {
  kv, err := itr.Next()
  if err != nil {
    // wrapped leveldb I/O error: log cause, check disk/DB health, retry or fail
    logger.Errorf("state iteration failed: %v", err)
    return err
  }
  _ = kv
}

Prevention

Monitor disk space and health on the peer's ledger volume
Never copy LevelDB files while the peer is running; use proper snapshots
On repeated iterator errors, plan a state DB rebuild from the blockchain
Keep the peer's statedb directory permissions owned by the peer process user

When it happens

Trigger: Calling Next() on a range-query scanner when s.dbItr.Error() is non-nil — i.e. goleveldb hit a read error (I/O error, corrupted SST file, locked/broken DB files) during iteration.

Common situations: Disk full or failing disk under the ledger data directory; corrupted LevelDB files after a crash or incomplete copy; permission changes on /var/hyperledger/production; DB files copied while the peer was running.

Related errors

AI-assisted analysis of hyperledger/fabric@2736b63f8f (2026-09-04). Data as JSON: /api/errors/2ddaf3c064571a6e. Report an issue: GitHub.