org.apache.hadoop.hive.ql.exec.TaskRunner Maven / Gradle / Ivy
/**
* 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.hive.ql.exec;
import java.io.Serializable;
import java.util.concurrent.atomic.AtomicLong;
import org.apache.hadoop.hive.ql.session.SessionState;
/**
* TaskRunner implementation.
**/
public class TaskRunner extends Thread {
protected Task tsk;
protected TaskResult result;
protected SessionState ss;
private static AtomicLong taskCounter = new AtomicLong(0);
private static ThreadLocal taskRunnerID = new ThreadLocal() {
@Override
protected Long initialValue() {
return taskCounter.incrementAndGet();
}
};
protected Thread runner;
public TaskRunner(Task tsk, TaskResult result) {
this.tsk = tsk;
this.result = result;
ss = SessionState.get();
}
public Task getTask() {
return tsk;
}
public TaskResult getTaskResult() {
return result;
}
public Thread getRunner() {
return runner;
}
public boolean isRunning() {
return result.isRunning();
}
@Override
public void run() {
runner = Thread.currentThread();
try {
SessionState.start(ss);
runSequential();
} finally {
runner = null;
}
}
/**
* Launches a task, and sets its exit value in the result variable.
*/
public void runSequential() {
int exitVal = -101;
try {
exitVal = tsk.executeTask();
} catch (Throwable t) {
if (tsk.getException() == null) {
tsk.setException(t);
}
t.printStackTrace();
}
result.setExitVal(exitVal, tsk.getException());
}
public static long getTaskRunnerID () {
return taskRunnerID.get();
}
}