hadoop StateStoreConnectionMonitorService 源码
haddop StateStoreConnectionMonitorService 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/store/StateStoreConnectionMonitorService.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 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 monitor the connection of the StateStore
* {@link StateStoreService} data store and to re-open the connection
* to the data store if required.
*/
public class StateStoreConnectionMonitorService extends PeriodicService {
private static final Logger LOG =
LoggerFactory.getLogger(StateStoreConnectionMonitorService.class);
/** Service that maintains the State Store connection. */
private final StateStoreService stateStore;
/**
* Create a new service to monitor the connectivity of the state store driver.
*
* @param store Instance of the state store to be monitored.
*/
public StateStoreConnectionMonitorService(StateStoreService store) {
super(StateStoreConnectionMonitorService.class.getSimpleName());
this.stateStore = store;
}
@Override
protected void serviceInit(Configuration conf) throws Exception {
this.setIntervalMs(conf.getLong(
RBFConfigKeys.FEDERATION_STORE_CONNECTION_TEST_MS,
RBFConfigKeys.FEDERATION_STORE_CONNECTION_TEST_MS_DEFAULT));
super.serviceInit(conf);
}
@Override
public void periodicInvoke() {
LOG.debug("Checking state store connection");
if (!stateStore.isDriverReady()) {
LOG.info("Attempting to open state store driver.");
stateStore.loadDriver();
}
}
}
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