RHBlockToKeyRangeIndex.java Source code

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Here is the source code for RHBlockToKeyRangeIndex.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.
 */

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.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.Mapper.Context;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;

import org.apache.hadoop.mapreduce.lib.input.CombineFileInputFormat;

public class RHBlockToKeyRangeIndex {

    public static class RMapper extends Mapper<Object, Text, Text, Text> {

        Log LOG = LogFactory.getLog(Mapper.class);
        boolean isFirst = true;
        String firstKey = null;
        String lastKey = null;

        public void map(Object key, Text value, Context context) throws IOException, InterruptedException {
            String strValue = value.toString().trim();
            int keyIndex = strValue.indexOf("\t");
            if (keyIndex == -1)
                return;

            if (isFirst) {
                firstKey = strValue.substring(0, keyIndex);
                isFirst = false;
            }
            lastKey = strValue.substring(0, keyIndex);
        }

        public void run(Context context) throws IOException, InterruptedException {
            setup(context);

            boolean hasNext = true;
            long startTime2;
            long nextKeyValueTime = 0;
            long mapTime = 0;

            long startTime = System.nanoTime();
            hasNext = context.nextKeyValue();
            nextKeyValueTime += System.nanoTime() - startTime;

            while (hasNext) {
                startTime2 = System.nanoTime();
                map(context.getCurrentKey(), context.getCurrentValue(), context);
                mapTime += System.nanoTime() - startTime2;

                startTime2 = System.nanoTime();
                hasNext = context.nextKeyValue();
                nextKeyValueTime += System.nanoTime() - startTime2;
            }
            long timeTaken = System.nanoTime() - startTime;

            LOG.fatal("^ MapperJob: " + context.getTaskAttemptID() + ", StartKey: " + firstKey + ", EndKey: "
                    + lastKey);

            LOG.fatal("^ MapperJob: " + context.getTaskAttemptID() + ", RunTimeTaken1(ns): " + timeTaken);

            LOG.fatal("^ MapperJob: " + context.getTaskAttemptID() + ", NextKeyValueTime(ns): " + nextKeyValueTime);

            LOG.fatal("^ MapperJob: " + context.getTaskAttemptID() + ", MapTime(ns): " + mapTime);

            cleanup(context);
        }
    }

    public static class RReducer extends Reducer<Text, Text, Text, Text> {
        public void reduce(Text key, Iterable<Text> values, Context context)
                throws IOException, InterruptedException {
        }
    }

    public static void main(String[] args) throws Exception {
        Configuration conf = new Configuration();
        String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
        if (otherArgs.length != 2) {
            System.err.println("Usage: rhblockindex <in> <out>");
            System.exit(2);
        }
        Job job = new Job(conf, "rhblockindex");
        job.setJarByClass(RHBlockToKeyRangeIndex.class);
        job.setMapperClass(RMapper.class);
        job.setCombinerClass(RReducer.class);
        job.setReducerClass(RReducer.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(IntWritable.class);

        FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
        FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
        System.exit(job.waitForCompletion(true) ? 0 : 1);
    }
}