io.gzinga.hadoop.TestSplittableGZipCodec.java Source code

Introduction

Here is the source code for io.gzinga.hadoop.TestSplittableGZipCodec.java

Source

/*
 * Copyright 2015 eBay Software Foundation
 *
 * Licensed 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 io.gzinga.hadoop;

import java.io.BufferedReader;
import java.io.File;
import java.io.InputStreamReader;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.reduce.IntSumReducer;
import io.gzinga.GZipOutputStreamRandomAccess;
import org.testng.Assert;
import org.testng.annotations.Test;

public class TestSplittableGZipCodec {

    @Test
    public void testSplittableGZipCodec() {
        try {
            Configuration conf = new Configuration();
            conf.set("fs.defaultFS", "file:///");
            FileSystem fs = FileSystem.get(conf);
            fs.mkdirs(new Path("target/test"));
            GZipOutputStreamRandomAccess gzip = new GZipOutputStreamRandomAccess(
                    fs.create(new Path("target/test/testfile1.gz")));
            String str = "This is line\n";
            for (int i = 1; i <= 10000; i++) {
                gzip.write(str.getBytes());
                if (i % 100 == 0) {
                    gzip.addOffset(i / 100l);
                }
            }
            Assert.assertEquals(gzip.getOffsetMap().size(), 100);
            gzip.close();

            conf.set("mapreduce.framework.name", "local");
            conf.set("io.compression.codecs", "io.gzinga.hadoop.SplittableGZipCodec");
            conf.set("mapreduce.input.fileinputformat.split.maxsize", "20000");
            Job job = new Job(conf, "word count");
            job.setJarByClass(WordCount.class);
            job.setMapperClass(WordCount.TokenizerMapper.class);
            job.setCombinerClass(IntSumReducer.class);
            job.setReducerClass(IntSumReducer.class);
            job.setOutputKeyClass(Text.class);
            job.setOutputValueClass(IntWritable.class);
            FileInputFormat.addInputPath(job, new Path("target/test/testfile1.gz"));
            FileOutputFormat.setOutputPath(job, new Path("target/test/testfile2"));
            job.waitForCompletion(true);

            BufferedReader br = new BufferedReader(
                    new InputStreamReader(fs.open(new Path("target/test/testfile2/part-r-00000"))));
            Assert.assertEquals("This\t10000", br.readLine());
            Assert.assertEquals("is\t10000", br.readLine());
            Assert.assertEquals("line\t10000", br.readLine());
            br.close();
        } catch (Exception e) {
            e.printStackTrace();
            Assert.fail();
        } finally {
            FileUtil.fullyDelete(new File("target/test/testfile2"));
            FileUtil.fullyDelete(new File("target/test/testfile1.gz"));
        }
    }
}