hadoop AutoRefreshRMFailoverProxyProvider 源码
haddop AutoRefreshRMFailoverProxyProvider 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/client/AutoRefreshRMFailoverProxyProvider.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.yarn.client;
import java.util.Map.Entry;
import java.util.Set;
import java.util.HashSet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.ipc.RPC;
/**
* A subclass of {@link RMFailoverProxyProvider} which tries to
* resolve the proxy DNS in the event of failover.
* This provider supports YARN Resourcemanager's HA mode.
* This provider doesn't support Federation.
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
public class AutoRefreshRMFailoverProxyProvider<T>
extends ConfiguredRMFailoverProxyProvider<T> {
private static final Logger LOG =
LoggerFactory.getLogger(AutoRefreshRMFailoverProxyProvider.class);
@Override
public synchronized void performFailover(T currentProxy) {
RPC.stopProxy(currentProxy);
//clears out all keys that map to currentProxy
Set<String> rmIds = new HashSet<>();
for (Entry<String, T> entry : proxies.entrySet()) {
T proxy = entry.getValue();
if (proxy.equals(currentProxy)) {
String rmId = entry.getKey();
rmIds.add(rmId);
}
}
for (String rmId : rmIds) {
proxies.remove(rmId);
}
super.performFailover(currentProxy);
}
}
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