com.aerospike.hadoop.examples.aggregateintinput.AggregateIntInput.java Source code

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Here is the source code for com.aerospike.hadoop.examples.aggregateintinput.AggregateIntInput.java

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/* 
 * Copyright 2014 Aerospike, Inc.
 *
 * Portions may be licensed to Aerospike, Inc. under one or more
 * contributor license agreements.
 *
 * 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 com.aerospike.hadoop.examples.aggregateintinput;

import java.io.IOException;
import java.util.StringTokenizer;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

import com.aerospike.hadoop.mapreduce.AerospikeConfigUtil;
import com.aerospike.hadoop.mapreduce.AerospikeInputFormat;
import com.aerospike.hadoop.mapreduce.AerospikeKey;
import com.aerospike.hadoop.mapreduce.AerospikeRecord;

public class AggregateIntInput extends Configured implements Tool {

    private static final Log log = LogFactory.getLog(AggregateIntInput.class);

    private static final int KK = 3163;

    private static final String binName = "bin1";

    public static class Map extends Mapper<AerospikeKey, AerospikeRecord, LongWritable, LongWritable> {

        private LongWritable val = new LongWritable();
        private LongWritable mod = new LongWritable();

        public void map(AerospikeKey key, AerospikeRecord rec, Context context)
                throws IOException, InterruptedException {
            int vv = (Integer) rec.bins.get(binName);
            val.set(vv);
            mod.set(vv % KK);
            context.write(mod, val);
        }
    }

    public static class Reduce extends Reducer<LongWritable, LongWritable, LongWritable, Text> {

        public void reduce(LongWritable mod, Iterable<LongWritable> values, Context context)
                throws IOException, InterruptedException {

            long num = 0; // number of elements
            long sum = 0; // sum of elements
            long min = Long.MAX_VALUE; // minimum element
            long max = Long.MIN_VALUE; // maximum element

            for (LongWritable val : values) {
                long vv = val.get();
                num += 1;
                sum += vv;
                if (vv < min)
                    min = vv;
                if (vv > max)
                    max = vv;
            }

            String rec = String.format("%d %d %d %d", num, min, max, sum);

            context.write(mod, new Text(rec));
        }
    }

    public int run(final String[] args) throws Exception {
        final Configuration conf = getConf();

        @SuppressWarnings("deprecation")
        final Job job = new Job(conf, "AerospikeAggregateIntInput");

        log.info("run starting on bin " + binName);

        job.setJarByClass(AggregateIntInput.class);
        job.setInputFormatClass(AerospikeInputFormat.class);
        job.setMapperClass(Map.class);
        job.setMapOutputKeyClass(LongWritable.class);
        job.setMapOutputValueClass(LongWritable.class);
        // job.setCombinerClass(Reduce.class); // no combiner
        job.setReducerClass(Reduce.class);
        job.setOutputKeyClass(LongWritable.class);
        job.setOutputValueClass(Text.class);

        FileOutputFormat.setOutputPath(job, new Path(args[0]));

        int status = job.waitForCompletion(true) ? 0 : 1;
        log.info("run finished, status=" + status);
        return status;
    }

    public static void main(final String[] args) throws Exception {
        System.exit(ToolRunner.run(new AggregateIntInput(), args));
    }
}

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