hadoop DefaultNoHARMFailoverProxyProvider 源码

  • 2022-10-20
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haddop DefaultNoHARMFailoverProxyProvider 代码


 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.hadoop.yarn.client;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.retry.DefaultFailoverProxyProvider;
import org.apache.hadoop.ipc.RPC;
import org.apache.hadoop.yarn.conf.YarnConfiguration;

import java.io.IOException;
import java.net.InetSocketAddress;

 * An implementation of {@link RMFailoverProxyProvider} which does nothing in
 * the event of failover, and always returns the same proxy object.
 * This is the default non-HA RM Failover proxy provider. It is used to replace
 * {@link DefaultFailoverProxyProvider} which was used as Yarn default non-HA.
public class DefaultNoHARMFailoverProxyProvider<T>
    implements RMFailoverProxyProvider<T> {
  private static final Logger LOG =

  protected T proxy;
  protected Class<T> protocol;

   * Initialize internal data structures, invoked right after instantiation.
   * @param conf     Configuration to use
   * @param proxy    The {@link RMProxy} instance to use
   * @param protocol The communication protocol to use
  public void init(Configuration conf, RMProxy<T> proxy,
                    Class<T> protocol) {
    this.protocol = protocol;
    try {
      YarnConfiguration yarnConf = new YarnConfiguration(conf);
      InetSocketAddress rmAddress =
          proxy.getRMAddress(yarnConf, protocol);
      LOG.info("Connecting to ResourceManager at {}", rmAddress);
      this.proxy = proxy.getProxy(yarnConf, protocol, rmAddress);
    } catch (IOException ioe) {
      LOG.error("Unable to create proxy to the ResourceManager ", ioe);

  public Class<T> getInterface() {
    return protocol;

  public ProxyInfo<T> getProxy() {
    return new ProxyInfo<T>(proxy, null);

   * PerformFailover does nothing in this class.
   * @param currentProxy
  public void performFailover(T currentProxy) {
    // Nothing to do.

   * Close the current proxy.
   * @throws IOException
  public void close() throws IOException {


hadoop 源码目录


hadoop AHSProxy 源码

hadoop AMRMClientUtils 源码

hadoop AutoRefreshNoHARMFailoverProxyProvider 源码

hadoop AutoRefreshRMFailoverProxyProvider 源码

hadoop ClientRMProxy 源码

hadoop ConfiguredRMFailoverProxyProvider 源码

hadoop NMProxy 源码

hadoop RMFailoverProxyProvider 源码

hadoop RMHAServiceTarget 源码

hadoop RMProxy 源码

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