org.apache.hadoop.mapred.TestSequenceFileInputFormat.java Source code

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Here is the source code for org.apache.hadoop.mapred.TestSequenceFileInputFormat.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.mapred;

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

import org.apache.commons.logging.*;

import org.apache.hadoop.fs.*;
import org.apache.hadoop.io.*;
import org.apache.hadoop.conf.*;

public class TestSequenceFileInputFormat 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");

        Reporter reporter = Reporter.NULL;

        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) {

            //LOG.info("creating; entries = " + length);

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

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

                // check each split
                BitSet bits = new BitSet(length);
                for (int j = 0; j < splits.length; j++) {
                    RecordReader<IntWritable, BytesWritable> reader = format.getRecordReader(splits[j], job,
                            reporter);
                    try {
                        int count = 0;
                        while (reader.next(key, value)) {
                            // if (bits.get(key.get())) {
                            // LOG.info("splits["+j+"]="+splits[j]+" : " + key.get());
                            // LOG.info("@"+reader.getPos());
                            // }
                            assertFalse("Key in multiple partitions.", bits.get(key.get()));
                            bits.set(key.get());
                            count++;
                        }
                        //LOG.info("splits["+j+"]="+splits[j]+" count=" + count);
                    } finally {
                        reader.close();
                    }
                }
                assertEquals("Some keys in no partition.", length, bits.cardinality());
            }

        }
    }

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