| /** |
| * 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.fs; |
| |
| import java.io.IOException; |
| import java.util.Arrays; |
| import java.util.Comparator; |
| import java.util.Random; |
| |
| import junit.framework.TestCase; |
| |
| import org.apache.hadoop.conf.Configuration; |
| |
| /** |
| * Testing the correctness of FileSystem.getFileBlockLocations. |
| */ |
| public class TestGetFileBlockLocations extends TestCase { |
| private static String TEST_ROOT_DIR = |
| System.getProperty("test.build.data", "/tmp/testGetFileBlockLocations"); |
| private static final int FileLength = 4 * 1024 * 1024; // 4MB |
| private Configuration conf; |
| private Path path; |
| private FileSystem fs; |
| private Random random; |
| |
| /** |
| * @see TestCase#setUp() |
| */ |
| @Override |
| protected void setUp() throws IOException { |
| conf = new Configuration(); |
| Path rootPath = new Path(TEST_ROOT_DIR); |
| path = new Path(rootPath, "TestGetFileBlockLocations"); |
| fs = rootPath.getFileSystem(conf); |
| FSDataOutputStream fsdos = fs.create(path, true); |
| byte[] buffer = new byte[1024]; |
| while (fsdos.getPos() < FileLength) { |
| fsdos.write(buffer); |
| } |
| fsdos.close(); |
| random = new Random(System.nanoTime()); |
| } |
| |
| private void oneTest(int offBegin, int offEnd, FileStatus status) |
| throws IOException { |
| if (offBegin > offEnd) { |
| int tmp = offBegin; |
| offBegin = offEnd; |
| offEnd = tmp; |
| } |
| BlockLocation[] locations = |
| fs.getFileBlockLocations(status, offBegin, offEnd - offBegin); |
| if (offBegin < status.getLen()) { |
| Arrays.sort(locations, new Comparator<BlockLocation>() { |
| |
| @Override |
| public int compare(BlockLocation arg0, BlockLocation arg1) { |
| long cmprv = arg0.getOffset() - arg1.getOffset(); |
| if (cmprv < 0) return -1; |
| if (cmprv > 0) return 1; |
| cmprv = arg0.getLength() - arg1.getLength(); |
| if (cmprv < 0) return -1; |
| if (cmprv > 0) return 1; |
| return 0; |
| } |
| |
| }); |
| offBegin = (int) Math.min(offBegin, status.getLen() - 1); |
| offEnd = (int) Math.min(offEnd, status.getLen()); |
| BlockLocation first = locations[0]; |
| BlockLocation last = locations[locations.length - 1]; |
| assertTrue(first.getOffset() <= offBegin); |
| assertTrue(offEnd <= last.getOffset() + last.getLength()); |
| } else { |
| assertTrue(locations.length == 0); |
| } |
| } |
| /** |
| * @see TestCase#tearDown() |
| */ |
| @Override |
| protected void tearDown() throws IOException { |
| fs.delete(path, true); |
| fs.close(); |
| } |
| |
| public void testFailureNegativeParameters() throws IOException { |
| FileStatus status = fs.getFileStatus(path); |
| try { |
| BlockLocation[] locations = fs.getFileBlockLocations(status, -1, 100); |
| fail("Expecting exception being throw"); |
| } catch (IllegalArgumentException e) { |
| |
| } |
| |
| try { |
| BlockLocation[] locations = fs.getFileBlockLocations(status, 100, -1); |
| fail("Expecting exception being throw"); |
| } catch (IllegalArgumentException e) { |
| |
| } |
| } |
| |
| public void testGetFileBlockLocations1() throws IOException { |
| FileStatus status = fs.getFileStatus(path); |
| oneTest(0, (int) status.getLen(), status); |
| oneTest(0, (int) status.getLen() * 2, status); |
| oneTest((int) status.getLen() * 2, (int) status.getLen() * 4, status); |
| oneTest((int) status.getLen() / 2, (int) status.getLen() * 3, status); |
| for (int i = 0; i < 10; ++i) { |
| oneTest((int) status.getLen() * i / 10, (int) status.getLen() * (i + 1) |
| / 10, status); |
| } |
| } |
| |
| public void testGetFileBlockLocations2() throws IOException { |
| FileStatus status = fs.getFileStatus(path); |
| for (int i = 0; i < 1000; ++i) { |
| int offBegin = random.nextInt((int) (2 * status.getLen())); |
| int offEnd = random.nextInt((int) (2 * status.getLen())); |
| oneTest(offBegin, offEnd, status); |
| } |
| } |
| } |