org.apache.hadoop.yarn.util.RMHAUtils.java Source code

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Here is the source code for org.apache.hadoop.yarn.util.RMHAUtils.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.yarn.util;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.fs.CommonConfigurationKeys;
import org.apache.hadoop.ha.HAServiceProtocol;
import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
import org.apache.hadoop.ha.HAServiceTarget;
import org.apache.hadoop.yarn.client.RMHAServiceTarget;
import org.apache.hadoop.yarn.conf.HAUtil;
import org.apache.hadoop.yarn.conf.YarnConfiguration;

@Private
@Unstable
public class RMHAUtils {

    public static String findActiveRMHAId(YarnConfiguration conf) {
        YarnConfiguration yarnConf = new YarnConfiguration(conf);
        Collection<String> rmIds = yarnConf.getStringCollection(YarnConfiguration.RM_HA_IDS);
        for (String currentId : rmIds) {
            yarnConf.set(YarnConfiguration.RM_HA_ID, currentId);
            try {
                HAServiceState haState = getHAState(yarnConf);
                if (haState.equals(HAServiceState.ACTIVE)) {
                    return currentId;
                }
            } catch (Exception e) {
                // Couldn't check if this RM is active. Do nothing. Worst case,
                // we wouldn't find an Active RM and return null.
            }
        }
        return null; // Couldn't find an Active RM
    }

    private static HAServiceState getHAState(YarnConfiguration yarnConf) throws Exception {
        HAServiceTarget haServiceTarget;
        int rpcTimeoutForChecks = yarnConf.getInt(CommonConfigurationKeys.HA_FC_CLI_CHECK_TIMEOUT_KEY,
                CommonConfigurationKeys.HA_FC_CLI_CHECK_TIMEOUT_DEFAULT);

        yarnConf.set(CommonConfigurationKeys.HADOOP_SECURITY_SERVICE_USER_NAME_KEY,
                yarnConf.get(YarnConfiguration.RM_PRINCIPAL, ""));
        haServiceTarget = new RMHAServiceTarget(yarnConf);
        HAServiceProtocol proto = haServiceTarget.getProxy(yarnConf, rpcTimeoutForChecks);
        HAServiceState haState = proto.getServiceStatus().getState();
        return haState;
    }

    public static List<String> getRMHAWebappAddresses(final YarnConfiguration conf) {
        String prefix;
        String defaultPort;
        if (YarnConfiguration.useHttps(conf)) {
            prefix = YarnConfiguration.RM_WEBAPP_HTTPS_ADDRESS;
            defaultPort = ":" + YarnConfiguration.DEFAULT_RM_WEBAPP_HTTPS_PORT;
        } else {
            prefix = YarnConfiguration.RM_WEBAPP_ADDRESS;
            defaultPort = ":" + YarnConfiguration.DEFAULT_RM_WEBAPP_PORT;
        }
        Collection<String> rmIds = conf.getStringCollection(YarnConfiguration.RM_HA_IDS);
        List<String> addrs = new ArrayList<String>();
        for (String id : rmIds) {
            String addr = conf.get(HAUtil.addSuffix(prefix, id));
            if (addr == null) {
                String hostname = conf.get(HAUtil.addSuffix(YarnConfiguration.RM_HOSTNAME, id));
                if (hostname != null) {
                    addr = hostname + defaultPort;
                }
            }
            if (addr != null) {
                addrs.add(addr);
            }
        }
        return addrs;
    }
}