hadoop IPFailoverProxyProvider 源码

  • 2022-10-20
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haddop IPFailoverProxyProvider 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.hdfs.server.namenode.ha;

import java.io.Closeable;
import java.io.IOException;
import java.net.URI;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSUtilClient;
import org.apache.hadoop.ipc.RPC;

 * A NNFailoverProxyProvider implementation which works on IP failover setup.
 * Only one proxy is used to connect to both servers and switching between
 * the servers is done by the environment/infrastructure, which guarantees
 * clients can consistently reach only one node at a time.
 * Clients with a live connection will likely get connection reset after an
 * IP failover. This case will be handled by the
 * FailoverOnNetworkExceptionRetry retry policy. I.e. if the call is
 * not idempotent, it won't get retried.
 * A connection reset while setting up a connection (i.e. before sending a
 * request) will be handled in ipc client.
 * The namenode URI must contain a resolvable host name.
public class IPFailoverProxyProvider<T> extends
    AbstractNNFailoverProxyProvider<T> {
  private final NNProxyInfo<T> nnProxyInfo;

  public IPFailoverProxyProvider(Configuration conf, URI uri,
      Class<T> xface, HAProxyFactory<T> factory) {
    super(conf, uri, xface, factory);
    this.nnProxyInfo = new NNProxyInfo<>(DFSUtilClient.getNNAddress(uri));

  public synchronized NNProxyInfo<T> getProxy() {
    // Create a non-ha proxy if not already created.
    return createProxyIfNeeded(nnProxyInfo);

  /** Nothing to do for IP failover */
  public void performFailover(T currentProxy) {

   * Close the proxy,
  public synchronized void close() throws IOException {
    if (nnProxyInfo.proxy == null) {
    if (nnProxyInfo.proxy instanceof Closeable) {
    } else {

   * Logical URI is not used for IP failover.
  public boolean useLogicalURI() {
    return false;


hadoop 源码目录


hadoop AbstractNNFailoverProxyProvider 源码

hadoop ClientHAProxyFactory 源码

hadoop ConfiguredFailoverProxyProvider 源码

hadoop HAProxyFactory 源码

hadoop InMemoryAliasMapFailoverProxyProvider 源码

hadoop ObserverReadProxyProvider 源码

hadoop ObserverReadProxyProviderWithIPFailover 源码

hadoop ReadOnly 源码

hadoop RequestHedgingProxyProvider 源码

hadoop WrappedFailoverProxyProvider 源码

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