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

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Here is the source code for org.apache.hadoop.mapred.TestFadvisedFileRegion.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.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.channels.WritableByteChannel;
import java.util.Random;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.util.StringUtils;
import org.junit.Assert;
import org.junit.Test;

public class TestFadvisedFileRegion {
    private final int FILE_SIZE = 16 * 1024 * 1024;
    private static final Log LOG = LogFactory.getLog(TestFadvisedFileRegion.class);

    @Test(timeout = 100000)
    public void testCustomShuffleTransfer() throws IOException {
        File absLogDir = new File("target", TestFadvisedFileRegion.class.getSimpleName() + "LocDir")
                .getAbsoluteFile();

        String testDirPath = StringUtils.join(Path.SEPARATOR,
                new String[] { absLogDir.getAbsolutePath(), "testCustomShuffleTransfer" });
        File testDir = new File(testDirPath);
        testDir.mkdirs();

        System.out.println(testDir.getAbsolutePath());

        File inFile = new File(testDir, "fileIn.out");
        File outFile = new File(testDir, "fileOut.out");

        //Initialize input file
        byte[] initBuff = new byte[FILE_SIZE];
        Random rand = new Random();
        rand.nextBytes(initBuff);

        FileOutputStream out = new FileOutputStream(inFile);
        try {
            out.write(initBuff);
        } finally {
            IOUtils.cleanup(LOG, out);
        }

        //define position and count to read from a file region.
        int position = 2 * 1024 * 1024;
        int count = 4 * 1024 * 1024 - 1;

        RandomAccessFile inputFile = null;
        RandomAccessFile targetFile = null;
        WritableByteChannel target = null;
        FadvisedFileRegion fileRegion = null;

        try {
            inputFile = new RandomAccessFile(inFile.getAbsolutePath(), "r");
            targetFile = new RandomAccessFile(outFile.getAbsolutePath(), "rw");
            target = targetFile.getChannel();

            Assert.assertEquals(FILE_SIZE, inputFile.length());

            //create FadvisedFileRegion
            fileRegion = new FadvisedFileRegion(inputFile, position, count, false, 0, null, null, 1024, false);

            //test corner cases
            customShuffleTransferCornerCases(fileRegion, target, count);

            long pos = 0;
            long size;
            while ((size = fileRegion.customShuffleTransfer(target, pos)) > 0) {
                pos += size;
            }

            //assert size
            Assert.assertEquals(count, (int) pos);
            Assert.assertEquals(count, targetFile.length());
        } finally {
            if (fileRegion != null) {
                fileRegion.releaseExternalResources();
            }
            IOUtils.cleanup(LOG, target);
            IOUtils.cleanup(LOG, targetFile);
            IOUtils.cleanup(LOG, inputFile);
        }

        //Read the target file and verify that copy is done correctly
        byte[] buff = new byte[FILE_SIZE];
        FileInputStream in = new FileInputStream(outFile);
        try {
            int total = in.read(buff, 0, count);

            Assert.assertEquals(count, total);

            for (int i = 0; i < count; i++) {
                Assert.assertEquals(initBuff[position + i], buff[i]);
            }
        } finally {
            IOUtils.cleanup(LOG, in);
        }

        //delete files and folders
        inFile.delete();
        outFile.delete();
        testDir.delete();
        absLogDir.delete();
    }

    private static void customShuffleTransferCornerCases(FadvisedFileRegion fileRegion, WritableByteChannel target,
            int count) {
        try {
            fileRegion.customShuffleTransfer(target, -1);
            Assert.fail("Expected a IllegalArgumentException");
        } catch (IllegalArgumentException ie) {
            LOG.info("Expected - illegal argument is passed.");
        } catch (Exception e) {
            Assert.fail("Expected a IllegalArgumentException");
        }

        //test corner cases
        try {
            fileRegion.customShuffleTransfer(target, count + 1);
            Assert.fail("Expected a IllegalArgumentException");
        } catch (IllegalArgumentException ie) {
            LOG.info("Expected - illegal argument is passed.");
        } catch (Exception e) {
            Assert.fail("Expected a IllegalArgumentException");
        }
    }
}