org.kaaproject.examples.spark.KaaSparkLauncher.java Source code

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Here is the source code for org.kaaproject.examples.spark.KaaSparkLauncher.java

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/*
 * Copyright 2014-2015 CyberVision, Inc.
 *
 * Licensed 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.kaaproject.examples.spark;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.spark.launcher.SparkLauncher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class KaaSparkLauncher {

    private static final Logger LOG = LoggerFactory.getLogger(KaaSparkLauncher.class);

    /*
     * Environment specific constants.
     * TODO: replace YOUR_HOST, YOUR_SPARK_HOME and YOUR_WORK_DIR
     */
    private static final String FLUME_BIND_HOST = "$YOUR_HOST$";
    private static final String FLUME_BIND_PORT = "7070";
    private static final String SPARK_MASTER_URL = "spark://$YOUR_HOST$:7077";
    private static final String SPARK_HOME = "$YOUR_SPARK_HOME$";
    private static final String SPARK_APP_JAR = "$YOUR_WORK_DIR$/spark/target/job.jar";

    private static final String KAA_SPARK_EXAMPLE_JOB_NAME = "KaaSparkExample";

    public static void main(String[] args) throws Exception {
        SparkLauncher launcher = new SparkLauncher().setMaster(SPARK_MASTER_URL).setSparkHome(SPARK_HOME)
                .setAppResource(SPARK_APP_JAR).setMainClass(KaaSparkExample.class.getName())
                .setAppName(KAA_SPARK_EXAMPLE_JOB_NAME).addAppArgs(FLUME_BIND_HOST, FLUME_BIND_PORT);

        final Process spark = launcher.launch();

        Runtime.getRuntime().addShutdownHook(new Thread() {
            @Override
            public void run() {
                LOG.warn("Spark job interrupted!");
                spark.destroy();
            }
        });

        Thread isReader = startReader(spark.getInputStream());
        Thread esReader = startReader(spark.getErrorStream());

        int resultCode = spark.waitFor();

        isReader.join();
        esReader.join();

        if (resultCode != 0) {
            LOG.warn("Spark job result code: {}", resultCode);
        }
    }

    private static Thread startReader(final InputStream is) {
        Thread t = new Thread(new Runnable() {

            @Override
            public void run() {
                BufferedReader reader = new BufferedReader(new InputStreamReader(is));
                String line;
                try {
                    while ((line = reader.readLine()) != null) {
                        LOG.debug(line);
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        });

        t.start();
        return t;
    }

}