/*
* 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.twill.example.yarn;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.twill.api.AbstractTwillRunnable;
import org.apache.twill.api.TwillController;
import org.apache.twill.api.TwillRunnerService;
import org.apache.twill.api.logging.PrinterLogHandler;
import org.apache.twill.common.Services;
import org.apache.twill.yarn.YarnTwillRunnerService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.PrintWriter;
import java.util.concurrent.ExecutionException;
/**
* Hello World example using twill-yarn to run a TwillApplication over YARN.
*/
public class HelloWorld {
public static Logger LOG = LoggerFactory.getLogger(HelloWorld.class);
/**
* Hello World runnable that is provided to TwillRunnerService to be run.
*/
private static class HelloWorldRunnable extends AbstractTwillRunnable {
@Override
public void run() {
LOG.info("Hello World. My first distributed application.");
}
@Override
public void stop() {
}
}
public static void main(String[] args) {
if (args.length < 1) {
System.err.println("Arguments format: <host:port of zookeeper server>");
}
String zkStr = args[0];
final TwillRunnerService twillRunner =
new YarnTwillRunnerService(
new YarnConfiguration(), zkStr);
twillRunner.startAndWait();
final TwillController controller =
twillRunner.prepare(new HelloWorldRunnable())
.addLogHandler(new PrinterLogHandler(new PrintWriter(System.out, true)))
.start();
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
controller.stopAndWait();
twillRunner.stopAndWait();
}
});
try {
Services.getCompletionFuture(controller).get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}
}