com.datascience.hadoop.CsvInputFormatTest.java Source code

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Here is the source code for com.datascience.hadoop.CsvInputFormatTest.java

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/*
 * Copyright 2015 the original author or authors.
 *
 * 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 com.datascience.hadoop;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.FileSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.util.ReflectionUtils;
import org.junit.Before;
import org.junit.Test;

import java.io.File;
import java.io.IOException;

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

/**
 * CSV input format tests.
 *
 * @author amareeshbasanapalli
 */
public class CsvInputFormatTest {
    CsvHelper helper;
    Configuration conf;
    JobConf jobConf;
    FileSystem fs;

    @Before
    public void initialize() throws IOException {
        helper = new CsvHelper();
        String[] columns = { "id", "first name", "last name" };
        conf = helper.buildConfiguration(",", "true", "\n", columns);
        jobConf = new JobConf(conf);
        fs = FileSystem.get(conf);
    }

    /**
     * Tests if CSVInputFormat returns a valid Record Reader.
     */
    @Test
    public void formatShouldReturnValidRecordReader() throws IOException {
        JobConf jobConf = new JobConf(conf);
        CsvInputFormat format = helper.createCSVInputFormat(conf);
        File inputFile = helper.getFile("/input/with-headers.txt.gz");
        Path inputPath = new Path(inputFile.getAbsoluteFile().toURI().toString());
        FileSplit split = helper.createFileSplit(inputPath, 0, inputFile.length());
        assertTrue(helper.createRecordReader(format, split, jobConf) instanceof CsvRecordReader);
    }

    /**
     * Tests to see if compressed files support splits.
     */
    @Test
    public void compressedFilesShouldNeverSplit() throws IOException {
        CsvInputFormat format = ReflectionUtils.newInstance(CsvInputFormat.class, conf);
        format.configure(jobConf);
        File inputFile = helper.getFile("/input/with-headers.txt.gz");
        Path inputPath = new Path(inputFile.getAbsoluteFile().toURI().toString());

        assertFalse(format.isSplitable(fs, inputPath));
        fs.close();
    }

}