com.streamsets.pipeline.hadoop.HadoopMapReduceBinding.java Source code

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Here is the source code for com.streamsets.pipeline.hadoop.HadoopMapReduceBinding.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 com.streamsets.pipeline.hadoop;

import com.streamsets.pipeline.ClusterBinding;
import com.streamsets.pipeline.Utils;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.output.NullOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.FileInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

public class HadoopMapReduceBinding implements ClusterBinding {
    private static final Logger LOG = LoggerFactory.getLogger(HadoopMapReduceBinding.class);
    private final String[] args;
    private Properties properties;
    private Job job;

    public HadoopMapReduceBinding(String[] args) {
        this.args = args;
    }

    private String getProperty(String name) {
        String val = Utils
                .checkArgumentNotNull(properties.getProperty(name), "Property " + name + " cannot be null").trim();
        LOG.info("Value of property: " + name + " is " + val);
        return val;
    }

    @Override
    public void init() throws Exception {
        Configuration conf = new Configuration();
        GenericOptionsParser parser = new GenericOptionsParser(conf, args);
        String[] remainingArgs = parser.getRemainingArgs();
        properties = new Properties();
        if (remainingArgs.length != 2) {
            List<String> argsList = new ArrayList<>();
            for (String arg : remainingArgs) {
                argsList.add("'" + arg + "'");
            }
            throw new IllegalArgumentException("Error expected properties-file java-opts got: " + argsList);
        }
        String propertiesFile = remainingArgs[0];
        String javaOpts = remainingArgs[1];
        try (InputStream in = new FileInputStream(propertiesFile)) {
            properties.load(in);
            String dataFormat = getProperty("dataFormat");
            String source = this.getClass().getSimpleName();
            for (Object key : properties.keySet()) {
                String realKey = String.valueOf(key);
                String value = getProperty(realKey);
                conf.set(realKey, value, source);
            }
            conf.set("mapred.child.java.opts", javaOpts);
            conf.setBoolean("mapreduce.map.speculative", false);
            conf.setBoolean("mapreduce.reduce.speculative", false);
            if (dataFormat.equalsIgnoreCase("AVRO")) {
                conf.set(Job.INPUT_FORMAT_CLASS_ATTR, "org.apache.avro.mapreduce.AvroKeyInputFormat");
                conf.set(Job.MAP_OUTPUT_KEY_CLASS, "org.apache.avro.mapred.AvroKey");
            }
            job = Job.getInstance(conf, "StreamSets Data Collector - Batch Execution Mode");
            job.setJarByClass(this.getClass());
            job.setNumReduceTasks(0);
            if (!dataFormat.equalsIgnoreCase("AVRO")) {
                job.setOutputKeyClass(NullWritable.class);
            }
            job.setMapperClass(PipelineMapper.class);

            job.setOutputValueClass(NullWritable.class);

            job.setOutputFormatClass(NullOutputFormat.class);
        }
    }

    @Override
    public void awaitTermination() throws Exception {
        job.waitForCompletion(true); // killed by ClusterProviderImpl before returning
    }

    @Override
    public void close() throws Exception {
        if (job != null) {
            job.killJob();
        }
    }
}