org.apache.carbondata.hadoop.csv.CSVInputFormatTest.java Source code

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Here is the source code for org.apache.carbondata.hadoop.csv.CSVInputFormatTest.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 org.apache.carbondata.hadoop.csv;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.carbondata.hadoop.io.StringArrayWritable;

import junit.framework.TestCase;
import org.junit.Assert;
import org.junit.Test;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.compress.BZip2Codec;
import org.apache.hadoop.io.compress.CompressionOutputStream;
import org.apache.hadoop.io.compress.GzipCodec;
import org.apache.hadoop.io.compress.Lz4Codec;
import org.apache.hadoop.io.compress.SnappyCodec;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

public class CSVInputFormatTest extends TestCase {

    /**
     * generate compressed files, no need to call this method.
     * @throws Exception
     */
    public void generateCompressFiles() throws Exception {
        String pwd = new File("src/test/resources").getCanonicalPath();
        String inputFile = pwd + "/data.csv";
        FileInputStream input = new FileInputStream(inputFile);
        Configuration conf = new Configuration();

        // .gz
        String outputFile = pwd + "/data.csv.gz";
        FileOutputStream output = new FileOutputStream(outputFile);
        GzipCodec gzip = new GzipCodec();
        gzip.setConf(conf);
        CompressionOutputStream outputStream = gzip.createOutputStream(output);
        int i = -1;
        while ((i = input.read()) != -1) {
            outputStream.write(i);
        }
        outputStream.close();
        input.close();

        // .bz2
        input = new FileInputStream(inputFile);
        outputFile = pwd + "/data.csv.bz2";
        output = new FileOutputStream(outputFile);
        BZip2Codec bzip2 = new BZip2Codec();
        bzip2.setConf(conf);
        outputStream = bzip2.createOutputStream(output);
        i = -1;
        while ((i = input.read()) != -1) {
            outputStream.write(i);
        }
        outputStream.close();
        input.close();

        // .snappy
        input = new FileInputStream(inputFile);
        outputFile = pwd + "/data.csv.snappy";
        output = new FileOutputStream(outputFile);
        SnappyCodec snappy = new SnappyCodec();
        snappy.setConf(conf);
        outputStream = snappy.createOutputStream(output);
        i = -1;
        while ((i = input.read()) != -1) {
            outputStream.write(i);
        }
        outputStream.close();
        input.close();

        //.lz4
        input = new FileInputStream(inputFile);
        outputFile = pwd + "/data.csv.lz4";
        output = new FileOutputStream(outputFile);
        Lz4Codec lz4 = new Lz4Codec();
        lz4.setConf(conf);
        outputStream = lz4.createOutputStream(output);
        i = -1;
        while ((i = input.read()) != -1) {
            outputStream.write(i);
        }
        outputStream.close();
        input.close();

    }

    /**
     * CSVCheckMapper check the content of csv files.
     */
    public static class CSVCheckMapper
            extends Mapper<NullWritable, StringArrayWritable, NullWritable, NullWritable> {
        @Override
        protected void map(NullWritable key, StringArrayWritable value, Context context)
                throws IOException, InterruptedException {
            String[] columns = value.get();
            int id = Integer.parseInt(columns[0]);
            int salary = Integer.parseInt(columns[6]);
            Assert.assertEquals(id - 1, salary - 15000);
        }
    }

    /**
     * test read csv files
     * @throws Exception
     */
    @Test
    public void testReadCSVFiles() throws Exception {
        Configuration conf = new Configuration();
        prepareConf(conf);
        Job job = Job.getInstance(conf, "CSVInputFormat_normal");
        job.setJarByClass(CSVInputFormatTest.class);
        job.setMapperClass(CSVCheckMapper.class);
        job.setNumReduceTasks(0);
        job.setInputFormatClass(CSVInputFormat.class);

        String inputFolder = new File("src/test/resources").getCanonicalPath();
        FileInputFormat.addInputPath(job, new Path(inputFolder + File.separator + "data.csv"));
        FileInputFormat.addInputPath(job, new Path(inputFolder + File.separator + "data.csv.bz2"));
        FileInputFormat.addInputPath(job, new Path(inputFolder + File.separator + "data.csv.gz"));
        // FileInputFormat.addInputPath(job, new Path(inputFolder + File.separator + "data.csv.lz4"));
        // FileInputFormat.addInputPath(job, new Path(inputFolder + File.separator + "data.csv.snappy"));

        File output = new File("target/output_CSVInputFormatTest");
        deleteOutput(output);
        FileOutputFormat.setOutputPath(job, new Path(output.getCanonicalPath()));

        Assert.assertTrue(job.waitForCompletion(true));
    }

    private void prepareConf(Configuration conf) {
        conf.setBoolean(CSVInputFormat.HEADER_PRESENT, true);
    }

    private void deleteOutput(File output) {
        if (output.exists()) {
            if (output.isDirectory()) {
                for (File file : output.listFiles()) {
                    deleteOutput(file);
                }
                output.delete();
            } else {
                output.delete();
            }
        }
    }
}