org.apache.hadoop.record.TestRecordWritable.java Source code

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Here is the source code for org.apache.hadoop.record.TestRecordWritable.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.hadoop.record;

import java.io.*;
import java.util.*;
import junit.framework.TestCase;

import org.apache.hadoop.fs.*;
import org.apache.hadoop.io.*;
import org.apache.hadoop.conf.*;
import org.apache.commons.logging.*;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.InputFormat;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordReader;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapred.SequenceFileInputFormat;

public class TestRecordWritable extends TestCase {
    private static final Log LOG = FileInputFormat.LOG;

    private static int MAX_LENGTH = 10000;
    private static Configuration conf = new Configuration();

    public void testFormat() throws Exception {
        JobConf job = new JobConf(conf);
        FileSystem fs = FileSystem.getLocal(conf);
        Path dir = new Path(System.getProperty("test.build.data", ".") + "/mapred");
        Path file = new Path(dir, "test.seq");

        int seed = new Random().nextInt();
        //LOG.info("seed = "+seed);
        Random random = new Random(seed);

        fs.delete(dir, true);

        FileInputFormat.setInputPaths(job, dir);

        // for a variety of lengths
        for (int length = 0; length < MAX_LENGTH; length += random.nextInt(MAX_LENGTH / 10) + 1) {

            // create a file with length entries
            SequenceFile.Writer writer = new SequenceFile.Writer(fs, conf, file, RecInt.class, RecBuffer.class);
            try {
                for (int i = 0; i < length; i++) {
                    RecInt key = new RecInt();
                    key.setData(i);
                    byte[] data = new byte[random.nextInt(10)];
                    random.nextBytes(data);
                    RecBuffer value = new RecBuffer();
                    value.setData(new Buffer(data));
                    writer.append(key, value);
                }
            } finally {
                writer.close();
            }

            // try splitting the file in a variety of sizes
            InputFormat<RecInt, RecBuffer> format = new SequenceFileInputFormat<RecInt, RecBuffer>();
            RecInt key = new RecInt();
            RecBuffer value = new RecBuffer();
            for (int i = 0; i < 3; i++) {
                int numSplits = random.nextInt(MAX_LENGTH / (SequenceFile.SYNC_INTERVAL / 20)) + 1;
                InputSplit[] splits = format.getSplits(job, numSplits);

                // check each split
                BitSet bits = new BitSet(length);
                for (int j = 0; j < splits.length; j++) {
                    RecordReader<RecInt, RecBuffer> reader = format.getRecordReader(splits[j], job, Reporter.NULL);
                    try {
                        int count = 0;
                        while (reader.next(key, value)) {
                            assertFalse("Key in multiple partitions.", bits.get(key.getData()));
                            bits.set(key.getData());
                            count++;
                        }
                    } finally {
                        reader.close();
                    }
                }
                assertEquals("Some keys in no partition.", length, bits.cardinality());
            }

        }
    }

    public static void main(String[] args) throws Exception {
        new TestRecordWritable().testFormat();
    }
}