hadoop HAProxyFactory 源码
haddop HAProxyFactory 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/HAProxyFactory.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.namenode.ha;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.ipc.AlignmentContext;
import org.apache.hadoop.security.UserGroupInformation;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* This interface aims to decouple the proxy creation implementation that used
* in {@link AbstractNNFailoverProxyProvider}. Client side can use
* {@link org.apache.hadoop.hdfs.protocol.ClientProtocol} to initialize the
* proxy while the server side can use NamenodeProtocols
*/
@InterfaceAudience.Private
public interface HAProxyFactory<T> {
T createProxy(Configuration conf, InetSocketAddress nnAddr, Class<T> xface,
UserGroupInformation ugi, boolean withRetries,
AtomicBoolean fallbackToSimpleAuth) throws IOException;
T createProxy(Configuration conf, InetSocketAddress nnAddr, Class<T> xface,
UserGroupInformation ugi, boolean withRetries) throws IOException;
/**
* Set the alignment context to be used when creating new proxies using
* this factory. Not all implementations will use this alignment context.
*/
default void setAlignmentContext(AlignmentContext alignmentContext) {
// noop
}
}
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