| /** |
| * 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. |
| */ |
| package org.apache.hadoop.hdfs.server.federation.store; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.hdfs.server.federation.resolver.MountTableManager; |
| import org.apache.hadoop.hdfs.server.federation.store.driver.StateStoreDriver; |
| import org.apache.hadoop.hdfs.server.federation.store.records.MountTable; |
| |
| /** |
| * Management API for the HDFS mount table information stored in |
| * {@link org.apache.hadoop.hdfs.server.federation.store.records.MountTable |
| * MountTable} records. The mount table contains entries that map a particular |
| * global namespace path one or more HDFS nameservices (NN) + target path. It is |
| * possible to map mount locations for root folders, directories or individual |
| * files. |
| * <p> |
| * Once fetched from the |
| * {@link org.apache.hadoop.hdfs.server.federation.store.driver.StateStoreDriver |
| * StateStoreDriver}, MountTable records are cached in a tree for faster access. |
| * Each path in the global namespace is mapped to a nameserivce ID and local |
| * path upon request. The cache is periodically updated by the @{link |
| * StateStoreCacheUpdateService}. |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Evolving |
| public abstract class MountTableStore extends CachedRecordStore<MountTable> |
| implements MountTableManager { |
| |
| public MountTableStore(StateStoreDriver driver) { |
| super(MountTable.class, driver); |
| } |
| } |
