org.apache.accumulo.examples.mapreduce.RegexExample.java Source code

Introduction

Here is the source code for org.apache.accumulo.examples.mapreduce.RegexExample.java

Source

/*
 * 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.examples.mapreduce;

import java.io.IOException;

import org.apache.accumulo.core.client.IteratorSetting;
import org.apache.accumulo.core.client.mapreduce.AccumuloInputFormat;
import org.apache.accumulo.core.data.Key;
import org.apache.accumulo.core.data.Value;
import org.apache.accumulo.core.iterators.user.RegExFilter;
import org.apache.accumulo.examples.cli.MapReduceClientOnRequiredTable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

import com.beust.jcommander.Parameter;

public class RegexExample extends Configured implements Tool {
    public static class RegexMapper extends Mapper<Key, Value, Key, Value> {
        @Override
        public void map(Key row, Value data, Context context) throws IOException, InterruptedException {
            context.write(row, data);
        }
    }

    static class Opts extends MapReduceClientOnRequiredTable {
        @Parameter(names = "--rowRegex")
        String rowRegex;
        @Parameter(names = "--columnFamilyRegex")
        String columnFamilyRegex;
        @Parameter(names = "--columnQualifierRegex")
        String columnQualifierRegex;
        @Parameter(names = "--valueRegex")
        String valueRegex;
        @Parameter(names = "--output", required = true)
        String destination;
    }

    @Override
    public int run(String[] args) throws Exception {
        Opts opts = new Opts();
        opts.parseArgs(getClass().getName(), args);

        Job job = Job.getInstance(getConf());
        job.setJobName(getClass().getSimpleName());
        job.setJarByClass(getClass());

        job.setInputFormatClass(AccumuloInputFormat.class);
        opts.setAccumuloConfigs(job);

        IteratorSetting regex = new IteratorSetting(50, "regex", RegExFilter.class);
        RegExFilter.setRegexs(regex, opts.rowRegex, opts.columnFamilyRegex, opts.columnQualifierRegex,
                opts.valueRegex, false);
        AccumuloInputFormat.addIterator(job, regex);

        job.setMapperClass(RegexMapper.class);
        job.setMapOutputKeyClass(Key.class);
        job.setMapOutputValueClass(Value.class);

        job.setNumReduceTasks(0);

        job.setOutputFormatClass(TextOutputFormat.class);
        TextOutputFormat.setOutputPath(job, new Path(opts.destination));

        System.out.println("setRowRegex: " + opts.rowRegex);
        System.out.println("setColumnFamilyRegex: " + opts.columnFamilyRegex);
        System.out.println("setColumnQualifierRegex: " + opts.columnQualifierRegex);
        System.out.println("setValueRegex: " + opts.valueRegex);

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

    public static void main(String[] args) throws Exception {
        int res = ToolRunner.run(new Configuration(), new RegexExample(), args);
        if (res != 0)
            System.exit(res);
    }
}