hadoop AHSProxy 源码
haddop AHSProxy 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/client/AHSProxy.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.io.IOException;
import java.net.InetSocketAddress;
import java.security.PrivilegedAction;
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.security.UserGroupInformation;
import org.apache.hadoop.yarn.ipc.YarnRPC;
@InterfaceAudience.Public
@InterfaceStability.Evolving
@SuppressWarnings("unchecked")
public class AHSProxy<T> {
private static final Logger LOG =
LoggerFactory.getLogger(AHSProxy.class);
public static <T> T createAHSProxy(final Configuration conf,
final Class<T> protocol, InetSocketAddress ahsAddress) throws IOException {
LOG.info("Connecting to Application History server at " + ahsAddress);
return (T) getProxy(conf, protocol, ahsAddress);
}
protected static <T> T getProxy(final Configuration conf,
final Class<T> protocol, final InetSocketAddress rmAddress)
throws IOException {
return UserGroupInformation.getCurrentUser().doAs(
new PrivilegedAction<T>() {
@Override
public T run() {
return (T) YarnRPC.create(conf).getProxy(protocol, rmAddress, conf);
}
});
}
}
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