org.apache.kudu.mapreduce.ITInputFormatJob.java Source code

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Here is the source code for org.apache.kudu.mapreduce.ITInputFormatJob.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
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// specific language governing permissions and limitations
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package org.apache.kudu.mapreduce;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import com.google.common.collect.Lists;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.output.NullOutputFormat;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.kudu.client.BaseKuduTest;
import org.apache.kudu.client.KuduPredicate;
import org.apache.kudu.client.RowResult;

public class ITInputFormatJob extends BaseKuduTest {
    private static final Logger LOG = LoggerFactory.getLogger(ITInputFormatJob.class);

    private static final String TABLE_NAME = ITInputFormatJob.class.getName() + "-" + System.currentTimeMillis();

    private static final HadoopTestingUtility HADOOP_UTIL = new HadoopTestingUtility();

    /** Counter enumeration to count the actual rows. */
    private static enum Counters {
        ROWS
    }

    @BeforeClass
    public static void setUpBeforeClass() throws Exception {
        BaseKuduTest.setUpBeforeClass();
    }

    @AfterClass
    public static void tearDownAfterClass() throws Exception {
        try {
            BaseKuduTest.tearDownAfterClass();
        } finally {
            HADOOP_UTIL.cleanup();
        }
    }

    @Test
    @SuppressWarnings("deprecation")
    public void test() throws Exception {

        createFourTabletsTableWithNineRows(TABLE_NAME);

        Configuration conf = new Configuration();
        HADOOP_UTIL.setupAndGetTestDir(ITInputFormatJob.class.getName(), conf).getAbsolutePath();

        createAndTestJob(conf, new ArrayList<KuduPredicate>(), 9);

        KuduPredicate pred1 = KuduPredicate.newComparisonPredicate(basicSchema.getColumnByIndex(0),
                KuduPredicate.ComparisonOp.GREATER_EQUAL, 20);
        createAndTestJob(conf, Lists.newArrayList(pred1), 6);

        KuduPredicate pred2 = KuduPredicate.newComparisonPredicate(basicSchema.getColumnByIndex(2),
                KuduPredicate.ComparisonOp.LESS_EQUAL, 1);
        createAndTestJob(conf, Lists.newArrayList(pred1, pred2), 2);
    }

    private void createAndTestJob(Configuration conf, List<KuduPredicate> predicates, int expectedCount)
            throws Exception {
        String jobName = ITInputFormatJob.class.getName();
        Job job = new Job(conf, jobName);

        Class<TestMapperTableInput> mapperClass = TestMapperTableInput.class;
        job.setJarByClass(mapperClass);
        job.setMapperClass(mapperClass);
        job.setNumReduceTasks(0);
        job.setOutputFormatClass(NullOutputFormat.class);
        KuduTableMapReduceUtil.TableInputFormatConfigurator configurator = new KuduTableMapReduceUtil.TableInputFormatConfigurator(
                job, TABLE_NAME, "*", getMasterAddresses()).operationTimeoutMs(DEFAULT_SLEEP).addDependencies(false)
                        .cacheBlocks(false);
        for (KuduPredicate predicate : predicates) {
            configurator.addPredicate(predicate);
        }
        configurator.configure();

        assertTrue("Test job did not end properly", job.waitForCompletion(true));

        assertEquals(expectedCount, job.getCounters().findCounter(Counters.ROWS).getValue());
    }

    /**
     * Simple row counter and printer
     */
    static class TestMapperTableInput extends Mapper<NullWritable, RowResult, NullWritable, NullWritable> {

        @Override
        protected void map(NullWritable key, RowResult value, Context context)
                throws IOException, InterruptedException {
            context.getCounter(Counters.ROWS).increment(1);
            LOG.info(value.toStringLongFormat()); // useful to visual debugging
        }
    }

}