hadoop StateStoreCache 源码

  • 2022-10-20
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haddop StateStoreCache 代码

文件路径:/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/store/StateStoreCache.java

/**
 * 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 java.io.IOException;

/**
 * Interface for a cached copy of the State Store.
 */
public interface StateStoreCache {

  /**
   * Load the cache from the State Store. Called by the cache update service
   * when the data has been reloaded.
   *
   * @param force If we force the load.
   * @return If the cache was loaded successfully.
   * @throws IOException If there was an error loading the cache.
   */
  boolean loadCache(boolean force) throws IOException;
}

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