org.apache.tajo.master.rm.TajoResourceManager.java Source code

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Here is the source code for org.apache.tajo.master.rm.TajoResourceManager.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.tajo.master.rm;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.service.CompositeService;
import org.apache.hadoop.yarn.event.AsyncDispatcher;
import org.apache.hadoop.yarn.event.EventHandler;
import org.apache.tajo.conf.TajoConf;
import org.apache.tajo.master.TajoMaster;
import org.apache.tajo.master.scheduler.AbstractQueryScheduler;
import org.apache.tajo.master.scheduler.QuerySchedulingInfo;
import org.apache.tajo.master.scheduler.event.SchedulerEventType;
import org.apache.tajo.util.TUtil;

import java.io.IOException;
import java.lang.reflect.Constructor;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;

/**
 * It manages all resources of tajo workers.
 */
public class TajoResourceManager extends CompositeService {
    /** class logger */
    private static final Log LOG = LogFactory.getLog(TajoResourceManager.class);

    protected static final Map<String, Class<? extends AbstractQueryScheduler>> SCHEDULER_CLASS_CACHE = Maps
            .newHashMap();

    private TajoMaster.MasterContext masterContext;

    private TajoRMContext rmContext;

    private String queryIdSeed;

    /**
     * Node Liveliness monitor
     */
    private NodeLivelinessMonitor nodeLivelinessMonitor;

    private TajoConf systemConf;
    private AbstractQueryScheduler scheduler;

    /** It receives status messages from workers and their resources. */
    private TajoResourceTracker resourceTracker;

    public TajoResourceManager(TajoMaster.MasterContext masterContext) {
        super(TajoResourceManager.class.getSimpleName());
        this.masterContext = masterContext;
    }

    @Override
    public void serviceInit(Configuration conf) throws Exception {
        this.systemConf = TUtil.checkTypeAndGet(conf, TajoConf.class);

        AsyncDispatcher dispatcher = new AsyncDispatcher();
        addIfService(dispatcher);

        rmContext = new TajoRMContext(dispatcher);

        this.queryIdSeed = String.valueOf(System.currentTimeMillis());

        this.nodeLivelinessMonitor = new NodeLivelinessMonitor(this.rmContext.getDispatcher());
        addIfService(this.nodeLivelinessMonitor);

        // Register event handler for Workers
        rmContext.getDispatcher().register(NodeEventType.class, new WorkerEventDispatcher(rmContext));

        resourceTracker = new TajoResourceTracker(this, nodeLivelinessMonitor);
        addIfService(resourceTracker);

        String schedulerClassName = systemConf.getVar(TajoConf.ConfVars.RESOURCE_SCHEDULER_CLASS);
        scheduler = loadScheduler(schedulerClassName);
        LOG.info("Loaded resource scheduler : " + scheduler.getClass());
        addIfService(scheduler);
        rmContext.getDispatcher().register(SchedulerEventType.class, scheduler);

        super.serviceInit(systemConf);
    }

    protected synchronized AbstractQueryScheduler loadScheduler(String schedulerClassName) throws Exception {
        Class<? extends AbstractQueryScheduler> schedulerClass;
        if (SCHEDULER_CLASS_CACHE.containsKey(schedulerClassName)) {
            schedulerClass = SCHEDULER_CLASS_CACHE.get(schedulerClassName);
        } else {
            schedulerClass = (Class<? extends AbstractQueryScheduler>) Class.forName(schedulerClassName);
            SCHEDULER_CLASS_CACHE.put(schedulerClassName, schedulerClass);
        }

        Constructor<? extends AbstractQueryScheduler> constructor = schedulerClass
                .getDeclaredConstructor(new Class[] { TajoMaster.MasterContext.class });
        constructor.setAccessible(true);

        return constructor.newInstance(new Object[] { masterContext });
    }

    @InterfaceAudience.Private
    public static final class WorkerEventDispatcher implements EventHandler<NodeEvent> {

        private final TajoRMContext rmContext;

        public WorkerEventDispatcher(TajoRMContext rmContext) {
            this.rmContext = rmContext;
        }

        @Override
        public void handle(NodeEvent event) {
            int workerId = event.getWorkerId();
            NodeStatus node = this.rmContext.getNodes().get(workerId);
            if (node != null) {
                try {
                    node.handle(event);
                } catch (Throwable t) {
                    LOG.error("Error in handling event type " + event.getType() + " for node " + workerId, t);
                }
            }
        }
    }

    public Map<Integer, NodeStatus> getNodes() {
        return ImmutableMap.copyOf(rmContext.getNodes());
    }

    public Map<Integer, NodeStatus> getInactiveNodes() {
        return ImmutableMap.copyOf(rmContext.getInactiveNodes());
    }

    public Collection<Integer> getQueryMasters() {
        return Collections.unmodifiableSet(rmContext.getQueryMasterWorker());
    }

    @Override
    public void serviceStop() throws Exception {
        super.serviceStop();
    }

    /**
     *
     * @return The prefix of queryId. It is generated when a TajoMaster starts up.
     */
    public String getSeedQueryId() throws IOException {
        return queryIdSeed;
    }

    @VisibleForTesting
    TajoResourceTracker getResourceTracker() {
        return resourceTracker;
    }

    public AbstractQueryScheduler getScheduler() {
        return scheduler;
    }

    public void submitQuery(QuerySchedulingInfo schedulingInfo) {
        scheduler.submitQuery(schedulingInfo);
    }

    public TajoRMContext getRMContext() {
        return rmContext;
    }
}