com.cloudera.knittingboar.io.TestSplitCalcs.java Source code

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Here is the source code for com.cloudera.knittingboar.io.TestSplitCalcs.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.cloudera.knittingboar.io;

import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.BitSet;
import java.util.Random;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordReader;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapred.TextInputFormat;

import junit.framework.TestCase;

public class TestSplitCalcs extends TestCase {

    private static final Log LOG = LogFactory.getLog(TestSplitCalcs.class.getName());

    private static int MAX_LENGTH = 1000;

    private static JobConf defaultConf = new JobConf();
    private static FileSystem localFs = null;
    static {
        try {
            defaultConf.set("fs.defaultFS", "file:///");
            localFs = FileSystem.getLocal(defaultConf);
        } catch (IOException e) {
            throw new RuntimeException("init failure", e);
        }
    }

    private static Path workDir = new Path(new Path(System.getProperty("test.build.data", "/tmp")),
            "TestSplitCalcs").makeQualified(localFs);

    /**
     * 
     * - use the TextInputFormat.getSplits() to test pulling split info
     * @throws IOException 
     * 
     */
    public void testGetSplits() throws IOException {

        TextInputFormat input = new TextInputFormat();

        JobConf job = new JobConf(defaultConf);
        Path file = new Path(workDir, "testGetSplits.txt");

        int tmp_file_size = 200000;

        long block_size = localFs.getDefaultBlockSize();

        System.out.println("default block size: " + (block_size / 1024 / 1024) + "MB");

        Writer writer = new OutputStreamWriter(localFs.create(file));
        try {
            for (int i = 0; i < tmp_file_size; i++) {
                writer.write(
                        "a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, 1, a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, 99");
                writer.write("\n");
            }
        } finally {
            writer.close();
        }

        System.out.println("file write complete");

        // A reporter that does nothing
        Reporter reporter = Reporter.NULL;

        //    localFs.delete(workDir, true);
        FileInputFormat.setInputPaths(job, file);

        // try splitting the file in a variety of sizes
        TextInputFormat format = new TextInputFormat();
        format.configure(job);
        LongWritable key = new LongWritable();
        Text value = new Text();

        int numSplits = 1;

        InputSplit[] splits = format.getSplits(job, numSplits);

        LOG.info("requested " + numSplits + " splits, splitting: got =        " + splits.length);

        assertEquals(2, splits.length);

        System.out.println("---- debug splits --------- ");

        for (int x = 0; x < splits.length; x++) {

            System.out.println("> Split [" + x + "]: " + splits[x].getLength() + ", " + splits[x].toString() + ", "
                    + splits[x].getLocations()[0]);

            RecordReader<LongWritable, Text> reader = format.getRecordReader(splits[x], job, reporter);
            try {
                int count = 0;
                while (reader.next(key, value)) {

                    if (count == 0) {
                        System.out.println("first: " + value.toString());
                        assertTrue(value.toString().contains("a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p"));
                    }

                    count++;
                }

                System.out.println("last: " + value.toString());

                assertTrue(value.toString().contains("a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p"));

            } finally {
                reader.close();
            }

        } // for each split

    }

}