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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.dolphinscheduler.server.master.runner;
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import org.apache.dolphinscheduler.common.Constants;
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import org.apache.dolphinscheduler.common.thread.Stopper;
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import org.apache.dolphinscheduler.common.thread.ThreadUtils;
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import org.apache.dolphinscheduler.common.utils.OSUtils;
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import org.apache.dolphinscheduler.common.zk.AbstractZKClient;
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import org.apache.dolphinscheduler.dao.ProcessDao;
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import org.apache.dolphinscheduler.dao.entity.ProcessInstance;
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import org.apache.dolphinscheduler.server.zk.ZKMasterClient;
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import org.apache.commons.configuration.Configuration;
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import org.apache.curator.framework.imps.CuratorFrameworkState;
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import org.apache.curator.framework.recipes.locks.InterProcessMutex;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.ThreadPoolExecutor;
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/**
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* master scheduler thread
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*/
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public class MasterSchedulerThread implements Runnable {
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private static final Logger logger = LoggerFactory.getLogger(MasterSchedulerThread.class);
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private final ExecutorService masterExecService;
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/**
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* escheduler database interface
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*/
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private final ProcessDao processDao;
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private final ZKMasterClient zkMasterClient ;
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private int masterExecThreadNum;
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private final Configuration conf;
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public MasterSchedulerThread(ZKMasterClient zkClient, ProcessDao processDao, Configuration conf, int masterExecThreadNum){
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this.processDao = processDao;
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this.zkMasterClient = zkClient;
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this.conf = conf;
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this.masterExecThreadNum = masterExecThreadNum;
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this.masterExecService = ThreadUtils.newDaemonFixedThreadExecutor("Master-Exec-Thread",masterExecThreadNum);
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}
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@Override
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public void run() {
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while (Stopper.isRunning()){
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// process instance
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ProcessInstance processInstance = null;
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InterProcessMutex mutex = null;
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try {
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if(OSUtils.checkResource(conf, true)){
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if (zkMasterClient.getZkClient().getState() == CuratorFrameworkState.STARTED) {
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// create distributed lock with the root node path of the lock space as /escheduler/lock/failover/master
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String znodeLock = zkMasterClient.getMasterLockPath();
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mutex = new InterProcessMutex(zkMasterClient.getZkClient(), znodeLock);
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mutex.acquire();
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ThreadPoolExecutor poolExecutor = (ThreadPoolExecutor) masterExecService;
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int activeCount = poolExecutor.getActiveCount();
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// make sure to scan and delete command table in one transaction
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processInstance = processDao.scanCommand(logger, OSUtils.getHost(), this.masterExecThreadNum - activeCount);
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if (processInstance != null) {
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logger.info("start master exex thread , split DAG ...");
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masterExecService.execute(new MasterExecThread(processInstance,processDao));
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}
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}
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}
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// accessing the command table every SLEEP_TIME_MILLIS milliseconds
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Thread.sleep(Constants.SLEEP_TIME_MILLIS);
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}catch (Exception e){
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logger.error("master scheduler thread exception : " + e.getMessage(),e);
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}finally{
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AbstractZKClient.releaseMutex(mutex);
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}
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}
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}
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}
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