| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /** |
| * Implementations of state store data providers/drivers. Each driver is |
| * responsible for maintaining, querying, updating and deleting persistent data |
| * records. Data records are defined as subclasses of |
| * {@link org.apache.hadoop.hdfs.server.federation.store.records.BaseRecord}. |
| * Each driver implements the |
| * {@link org.apache.hadoop.hdfs.server.federation.store.driver.StateStoreDriver |
| * StateStoreDriver} interface. |
| * <p> |
| * Currently supported drivers: |
| * <ul> |
| * <li>{@link StateStoreFileImpl} A file-based data storage backend. |
| * <li>{@link StateStoreZooKeeperImpl} A zookeeper based data storage backend. |
| * </ul> |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Evolving |
| package org.apache.hadoop.hdfs.server.federation.store.driver.impl; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |