org.apache.hadoop.yarn.server.resourcemanager.placement.PlacementManager.java Source code

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Here is the source code for org.apache.hadoop.yarn.server.resourcemanager.placement.PlacementManager.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.server.resourcemanager.placement;

import java.util.List;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock.ReadLock;
import java.util.concurrent.locks.ReentrantReadWriteLock.WriteLock;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.yarn.api.records.ApplicationSubmissionContext;
import org.apache.hadoop.yarn.exceptions.YarnException;

import com.google.common.annotations.VisibleForTesting;

public class PlacementManager {
    private static final Log LOG = LogFactory.getLog(PlacementManager.class);

    List<PlacementRule> rules;
    ReadLock readLock;
    WriteLock writeLock;

    public PlacementManager() {
        ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
        readLock = lock.readLock();
        writeLock = lock.writeLock();
    }

    public void updateRules(List<PlacementRule> rules) {
        try {
            writeLock.lock();
            this.rules = rules;
        } finally {
            writeLock.unlock();
        }
    }

    public void placeApplication(ApplicationSubmissionContext asc, String user) throws YarnException {
        try {
            readLock.lock();
            if (null == rules || rules.isEmpty()) {
                return;
            }

            String newQueueName = null;
            for (PlacementRule rule : rules) {
                newQueueName = rule.getQueueForApp(asc, user);
                if (newQueueName != null) {
                    break;
                }
            }

            // Failed to get where to place application
            if (null == newQueueName && null == asc.getQueue()) {
                String msg = "Failed to get where to place application=" + asc.getApplicationId();
                LOG.error(msg);
                throw new YarnException(msg);
            }

            // Set it to ApplicationSubmissionContext
            if (!StringUtils.equals(asc.getQueue(), newQueueName)) {
                LOG.info("Placed application=" + asc.getApplicationId() + " to queue=" + newQueueName
                        + ", original queue=" + asc.getQueue());
                asc.setQueue(newQueueName);
            }
        } finally {
            readLock.unlock();
        }
    }

    @VisibleForTesting
    public List<PlacementRule> getPlacementRules() {
        return rules;
    }
}