org.apache.accumulo.server.test.randomwalk.sequential.MapRedVerifyTool.java Source code

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Here is the source code for org.apache.accumulo.server.test.randomwalk.sequential.MapRedVerifyTool.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 org.apache.accumulo.server.test.randomwalk.sequential;

import java.io.IOException;
import java.util.Iterator;

import org.apache.accumulo.core.client.mapreduce.AccumuloInputFormat;
import org.apache.accumulo.core.client.mapreduce.AccumuloOutputFormat;
import org.apache.accumulo.core.data.Key;
import org.apache.accumulo.core.data.Mutation;
import org.apache.accumulo.core.data.Value;
import org.apache.accumulo.core.security.Authorizations;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.util.Tool;
import org.apache.log4j.Logger;

public class MapRedVerifyTool extends Configured implements Tool {
    protected final Logger log = Logger.getLogger(this.getClass());

    public static class SeqMapClass extends Mapper<Key, Value, NullWritable, IntWritable> {
        public void map(Key row, Value data, Context output) throws IOException, InterruptedException {
            Integer num = Integer.valueOf(row.getRow().toString());
            output.write(NullWritable.get(), new IntWritable(num.intValue()));
        }
    }

    public static class SeqReduceClass extends Reducer<NullWritable, IntWritable, Text, Mutation> {
        @Override
        public void reduce(NullWritable ignore, Iterable<IntWritable> values, Context output)
                throws IOException, InterruptedException {
            Iterator<IntWritable> iterator = values.iterator();

            if (iterator.hasNext() == false) {
                return;
            }

            int start = iterator.next().get();
            int index = start;
            while (iterator.hasNext()) {
                int next = iterator.next().get();
                if (next != (index + 1)) {
                    writeMutation(output, start, index);
                    start = next;
                }
                index = next;
            }
            writeMutation(output, start, index);
        }

        public void writeMutation(Context output, int start, int end) throws IOException, InterruptedException {
            Mutation m = new Mutation(new Text(String.format("%010d", start)));
            m.put(new Text(String.format("%010d", end)), new Text(""), new Value("".getBytes()));
            output.write(null, m);
        }
    }

    public int run(String[] args) throws Exception {
        Job job = new Job(getConf(), this.getClass().getSimpleName());
        job.setJarByClass(this.getClass());

        if (job.getJar() == null) {
            log.error("M/R requires a jar file!  Run mvn package.");
            return 1;
        }

        job.setInputFormatClass(AccumuloInputFormat.class);
        AccumuloInputFormat.setInputInfo(job.getConfiguration(), args[0], args[1].getBytes(), args[2],
                new Authorizations());
        AccumuloInputFormat.setZooKeeperInstance(job.getConfiguration(), args[3], args[4]);

        job.setMapperClass(SeqMapClass.class);
        job.setMapOutputKeyClass(NullWritable.class);
        job.setMapOutputValueClass(IntWritable.class);

        job.setReducerClass(SeqReduceClass.class);
        job.setNumReduceTasks(1);

        job.setOutputFormatClass(AccumuloOutputFormat.class);
        AccumuloOutputFormat.setOutputInfo(job.getConfiguration(), args[0], args[1].getBytes(), true, args[5]);
        AccumuloOutputFormat.setZooKeeperInstance(job.getConfiguration(), args[3], args[4]);

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