dz.lab.mapred.hbase.custom_input.StartsWithCountJob

Introduction

Here is the source code for dz.lab.mapred.hbase.custom_input.StartsWithCountJob_HBaseInput.java
Source

/**
 * (c) Copyright 2005-2014 Heavenize SAS
 * 34, rue serpente, 75006 Paris, FRANCE
 * HEAVENIZE project
 *
 * This code is the property of Heavenize SAS
 * Registration : RCS PARIS B 508 496 528
 * For any question or license, please contact Heavenize at info@heavenize.com
 */
package dz.lab.mapred.hbase.custom_input;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.mapreduce.TableInputFormat;
import org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
import org.apache.hadoop.util.Tool;

import static org.apache.hadoop.hbase.util.Bytes.toBytes;
import dz.lab.mapred.StartsWithCountReducer;
import dz.lab.mapred.hbase.custom_output.StartsWithCountMapper_HBase;

public class StartsWithCountJob_HBaseInput extends Configured implements Tool {
    protected final static String TABLE_NAME = "HBaseSamples";
    protected final static byte[] FAMILY = toBytes("count");
    protected final static byte[] COLUMN = toBytes("word");

    /*
     * (non-Javadoc)
     * @see org.apache.hadoop.util.Tool#run(java.lang.String[])
     */
    @Override
    public int run(String[] args) throws Exception {
        Job job = Job.getInstance(getConf(), "StartsWithCount-FromHBase");
        job.setJarByClass(getClass());

        // set HBase InputFormat
        job.setInputFormatClass(TableInputFormat.class);
        // new mapper to handle data from HBase
        job.setMapperClass(StartsWithCountMapper_HBase.class);

        // add hbase configuration
        Configuration conf = job.getConfiguration();
        HBaseConfiguration.merge(conf, HBaseConfiguration.create(conf));
        TableMapReduceUtil.addDependencyJars(job);

        // specify table and column to read from
        conf.set(TableInputFormat.INPUT_TABLE, TABLE_NAME);
        conf.set(TableInputFormat.SCAN_COLUMNS, "count:word");

        // configure mapper and reducer
        job.setCombinerClass(StartsWithCountReducer.class);
        job.setReducerClass(StartsWithCountReducer.class);

        // configure output
        TextOutputFormat.setOutputPath(job, new Path(args[0]));
        job.setOutputFormatClass(TextOutputFormat.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(IntWritable.class);

        return job.waitForCompletion(true) ? 0 : 1;
    }

}
dz.lab.mapred.hbase.custom_input.StartsWithCountJob_HBaseInput.java Source code

Introduction

Source
