hadoop StateStoreCacheUpdateService 源码
haddop StateStoreCacheUpdateService 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/store/StateStoreCacheUpdateService.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.util.concurrent.TimeUnit;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.server.federation.router.PeriodicService;
import org.apache.hadoop.hdfs.server.federation.router.RBFConfigKeys;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Service to periodically update the {@link StateStoreService}
* cached information in the
* {@link org.apache.hadoop.hdfs.server.federation.router.Router Router}.
* This is for performance and removes the State Store from the critical path
* in common operations.
*/
public class StateStoreCacheUpdateService extends PeriodicService {
private static final Logger LOG =
LoggerFactory.getLogger(StateStoreCacheUpdateService.class);
/** The service that manages the State Store connection. */
private final StateStoreService stateStore;
/**
* Create a new Cache update service.
*
* @param stateStore Implementation of the state store
*/
public StateStoreCacheUpdateService(StateStoreService stateStore) {
super(StateStoreCacheUpdateService.class.getSimpleName());
this.stateStore = stateStore;
}
@Override
protected void serviceInit(Configuration conf) throws Exception {
this.setIntervalMs(conf.getTimeDuration(
RBFConfigKeys.DFS_ROUTER_CACHE_TIME_TO_LIVE_MS,
RBFConfigKeys.DFS_ROUTER_CACHE_TIME_TO_LIVE_MS_DEFAULT,
TimeUnit.MILLISECONDS));
super.serviceInit(conf);
}
@Override
public void periodicInvoke() {
LOG.debug("Updating State Store cache");
stateStore.refreshCaches();
}
}
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