com.avira.couchdoop.jobs.CouchbaseViewToHBaseImporter.java Source code

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Here is the source code for com.avira.couchdoop.jobs.CouchbaseViewToHBaseImporter.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 com.avira.couchdoop.jobs;

import com.avira.couchdoop.ArgsException;
import com.avira.couchdoop.ArgsHelper;
import com.avira.couchdoop.imp.CouchbaseViewInputFormat;
import com.avira.couchdoop.imp.CouchbaseViewToHBaseMapper;
import com.avira.couchdoop.imp.ImportViewToHBaseArgs;
import org.apache.commons.lang.exception.ExceptionUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.hbase.mapreduce.IdentityTableReducer;
import org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;

/**
 * Instances of this class import documents of Couchbase view keys in HDFS files.
 */
public class CouchbaseViewToHBaseImporter extends Configured implements Tool {

    private static final Logger LOGGER = LoggerFactory.getLogger(CouchbaseViewToHBaseImporter.class);

    public void start(String[] args) throws ArgsException {
        int exitCode = 0;
        try {
            exitCode = ToolRunner.run(this, args);
        } catch (ArgsException e) {
            throw e;
        } catch (Exception e) {
            LOGGER.error(ExceptionUtils.getStackTrace(e));
        }

        System.exit(exitCode);
    }

    @Override
    public int run(String[] args) throws ArgsException {
        Configuration conf = getConf();

        ArgsHelper.loadCliArgsIntoHadoopConf(conf, ImportViewToHBaseArgs.ARGS_LIST, args);
        ImportViewToHBaseArgs importViewToHBaseArgs = new ImportViewToHBaseArgs(conf);

        Job job;
        boolean exitStatus = true;
        try {
            job = configureJob(conf, importViewToHBaseArgs.getTable());
            exitStatus = job.waitForCompletion(true);
        } catch (Exception e) {
            LOGGER.error(ExceptionUtils.getStackTrace(e));
        }

        return exitStatus ? 0 : 2;
    }

    public Job configureJob(Configuration conf, String outputTable) throws IOException {
        conf.setInt("mapreduce.map.failures.maxpercent", 5);
        conf.setInt("mapred.max.map.failures.percent", 5);
        conf.setInt("mapred.max.tracker.failures", 20);

        Job job = Job.getInstance(conf);
        job.setJarByClass(CouchbaseViewToHBaseImporter.class);

        // Input
        job.setInputFormatClass(CouchbaseViewInputFormat.class);

        // Mapper
        job.setMapperClass(CouchbaseViewToHBaseMapper.class);

        // Reducer
        job.setNumReduceTasks(0);

        // Output
        TableMapReduceUtil.initTableReducerJob(outputTable, IdentityTableReducer.class, job);

        return job;
    }
}