com.accumulobook.advanced.mapreduce.MapReduceFilesExample.java Source code

Introduction

Here is the source code for com.accumulobook.advanced.mapreduce.MapReduceFilesExample.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 com.accumulobook.advanced.mapreduce;

import com.accumulobook.ExampleMiniCluster;
import com.accumulobook.WikipediaConstants;
import com.accumulobook.basic.WikipediaClient;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.apache.accumulo.core.client.BatchWriterConfig;
import org.apache.accumulo.core.client.ClientConfiguration;
import org.apache.accumulo.core.client.Connector;
import org.apache.accumulo.core.client.ZooKeeperInstance;
import org.apache.accumulo.core.client.mapreduce.AccumuloInputFormat;
import org.apache.accumulo.core.client.mapreduce.AccumuloOutputFormat;
import org.apache.accumulo.core.client.security.tokens.PasswordToken;
import org.apache.accumulo.core.security.Authorizations;
import org.apache.accumulo.core.util.Pair;
import org.apache.accumulo.core.util.shell.Shell;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.util.Tool;

public class MapReduceFilesExample implements Tool {

    public static void main(String[] args) throws Exception {

        // startup mini accumulo and ingest data
        System.out.println("Ingesting example wikipedia articles ...");
        Connector conn = ExampleMiniCluster.getConnector();

        WikipediaClient client = new WikipediaClient(conn, new Authorizations());

        client.ingest(WikipediaConstants.HADOOP_PAGES);

        // start mr cluster
        System.out.println("done. starting mini mr cluster ...");
        MiniMRClusterRunner mmrce = new MiniMRClusterRunner();
        mmrce.setup();
        mmrce.start();

        System.out.println("started. running mapreduce files example ...");
        MapReduceFilesExample mrfe = new MapReduceFilesExample();

        mrfe.run(new String[] { ExampleMiniCluster.getInstanceName(), ExampleMiniCluster.getZooKeepers(), "root",
                "password" });

        System.out.println("done. Starting shell ...");

        String[] shellArgs = new String[] { "-u", "root", "-p", "password", "-z",
                ExampleMiniCluster.getInstanceName(), ExampleMiniCluster.getZooKeepers() };

        Shell.main(shellArgs);
        mmrce.stop();
        ExampleMiniCluster.shutdown();
    }

    Configuration conf = null;

    @Override
    public int run(String[] args) throws Exception {

        Job job = Job.getInstance(this.getConf());
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(IntWritable.class);

        job.setMapperClass(WordCount.WordCountMapper.class);
        job.setCombinerClass(WordCount.WordCountCombiner.class);
        job.setReducerClass(WordCount.WordCountReducer.class);

        // clone the articles table
        ZooKeeperInstance inst = new ZooKeeperInstance(args[0], args[1]);
        Connector conn = inst.getConnector(args[2], new PasswordToken(args[3]));

        conn.tableOperations().clone(WikipediaConstants.ARTICLES_TABLE, WikipediaConstants.ARTICLES_TABLE_CLONE,
                true, Collections.EMPTY_MAP, Collections.EMPTY_SET);

        // take cloned table offline, waiting until the operation is complete
        boolean wait = true;
        conn.tableOperations().offline(WikipediaConstants.ARTICLES_TABLE_CLONE, wait);

        ClientConfiguration zkiConfig = new ClientConfiguration().withInstance(args[0]).withZkHosts(args[1]);

        // input
        job.setInputFormatClass(AccumuloInputFormat.class);
        AccumuloInputFormat.setInputTableName(job, WikipediaConstants.ARTICLES_TABLE_CLONE);
        List<Pair<Text, Text>> columns = new ArrayList<>();
        columns.add(new Pair(WikipediaConstants.CONTENTS_FAMILY_TEXT, new Text("")));

        AccumuloInputFormat.fetchColumns(job, columns);
        AccumuloInputFormat.setZooKeeperInstance(job, zkiConfig);
        AccumuloInputFormat.setConnectorInfo(job, args[2], new PasswordToken(args[3]));

        // configure to use underlying RFiles
        AccumuloInputFormat.setOfflineTableScan(job, true);

        // output
        job.setOutputFormatClass(AccumuloOutputFormat.class);

        BatchWriterConfig bwConfig = new BatchWriterConfig();

        AccumuloOutputFormat.setBatchWriterOptions(job, bwConfig);
        AccumuloOutputFormat.setZooKeeperInstance(job, zkiConfig);
        AccumuloOutputFormat.setConnectorInfo(job, args[2], new PasswordToken(args[3]));
        AccumuloOutputFormat.setDefaultTableName(job, WikipediaConstants.WORD_COUNT_TABLE);
        AccumuloOutputFormat.setCreateTables(job, true);

        job.setJarByClass(WordCount.class);

        job.waitForCompletion(true);
        //job.submit();

        return 0;
    }

    @Override
    public void setConf(Configuration conf) {
        this.conf = conf;
    }

    @Override
    public Configuration getConf() {
        if (this.conf == null) {
            this.conf = new Configuration();
        }

        return this.conf;
    }
}