org.apache.hadoop.mapred.Master.java Source code

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Here is the source code for org.apache.hadoop.mapred.Master.java

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/**
* 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;
    }
}