public RocksDBKeyedStateBackend( JobID jobId, String operatorIdentifier, ClassLoader userCodeClassLoader, File instanceBasePath, DBOptions dbOptions, ColumnFamilyOptions columnFamilyOptions, TaskKvStateRegistry kvStateRegistry, TypeSerializer<K> keySerializer, int numberOfKeyGroups, KeyGroupRange keyGroupRange, Collection<KeyGroupsStateHandle> restoreState) throws Exception { this( jobId, operatorIdentifier, userCodeClassLoader, instanceBasePath, dbOptions, columnFamilyOptions, kvStateRegistry, keySerializer, numberOfKeyGroups, keyGroupRange); LOG.info("Initializing RocksDB keyed state backend from snapshot."); if (LOG.isDebugEnabled()) { LOG.debug("Restoring snapshot from state handles: {}.", restoreState); } try { if (MigrationUtil.isOldSavepointKeyedState(restoreState)) { LOG.info("Converting RocksDB state from old savepoint."); restoreOldSavepointKeyedState(restoreState); } else { RocksDBRestoreOperation restoreOperation = new RocksDBRestoreOperation(this); restoreOperation.doRestore(restoreState); } } catch (Exception ex) { dispose(); throw ex; } }