hadoop Master 源码
haddop Master 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/Master.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.mapred;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapreduce.MRConfig;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.security.SecurityUtil;
import org.apache.hadoop.yarn.client.util.YarnClientUtils;
@Private
@Unstable
public class Master {
public enum State {
INITIALIZING, RUNNING;
}
public static String getMasterAddress(Configuration conf) {
String masterAddress = conf.get(MRConfig.MASTER_ADDRESS, "localhost:8012");
return NetUtils.createSocketAddr(masterAddress, 8012,
MRConfig.MASTER_ADDRESS).getHostName();
}
public static String getMasterPrincipal(Configuration conf)
throws IOException {
String masterPrincipal;
String framework = conf.get(MRConfig.FRAMEWORK_NAME,
MRConfig.YARN_FRAMEWORK_NAME);
if (framework.equals(MRConfig.CLASSIC_FRAMEWORK_NAME)) {
String masterAddress = getMasterAddress(conf);
// get kerberos principal for use as delegation token renewer
masterPrincipal =
SecurityUtil.getServerPrincipal(conf.get(MRConfig.MASTER_USER_NAME),
masterAddress);
} else {
masterPrincipal = YarnClientUtils.getRmPrincipal(conf);
}
return masterPrincipal;
}
}
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