[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | package org.apache.hadoop.fs; |
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| 19 | |
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| 20 | import java.io.File; |
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| 21 | import java.io.IOException; |
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| 22 | |
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| 23 | import org.apache.hadoop.conf.Configuration; |
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| 24 | import org.apache.hadoop.util.Shell; |
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| 25 | |
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| 26 | import junit.framework.TestCase; |
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| 27 | |
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| 28 | /** This test LocalDirAllocator works correctly; |
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| 29 | * Every test case uses different buffer dirs to |
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| 30 | * enforce the AllocatorPerContext initialization. |
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| 31 | * This test does not run on Cygwin because under Cygwin |
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| 32 | * a directory can be created in a read-only directory |
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| 33 | * which breaks this test. |
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| 34 | */ |
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| 35 | public class TestLocalDirAllocator extends TestCase { |
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| 36 | final static private Configuration conf = new Configuration(); |
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| 37 | final static private String BUFFER_DIR_ROOT = "build/test/temp"; |
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| 38 | final static private Path BUFFER_PATH_ROOT = new Path(BUFFER_DIR_ROOT); |
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| 39 | final static private File BUFFER_ROOT = new File(BUFFER_DIR_ROOT); |
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| 40 | final static private String BUFFER_DIR[] = new String[] { |
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| 41 | BUFFER_DIR_ROOT+"/tmp0", BUFFER_DIR_ROOT+"/tmp1", BUFFER_DIR_ROOT+"/tmp2", |
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| 42 | BUFFER_DIR_ROOT+"/tmp3", BUFFER_DIR_ROOT+"/tmp4", BUFFER_DIR_ROOT+"/tmp5", |
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| 43 | BUFFER_DIR_ROOT+"/tmp6"}; |
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| 44 | final static private Path BUFFER_PATH[] = new Path[] { |
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| 45 | new Path(BUFFER_DIR[0]), new Path(BUFFER_DIR[1]), new Path(BUFFER_DIR[2]), |
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| 46 | new Path(BUFFER_DIR[3]), new Path(BUFFER_DIR[4]), new Path(BUFFER_DIR[5]), |
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| 47 | new Path(BUFFER_DIR[6])}; |
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| 48 | final static private String CONTEXT = "dfs.client.buffer.dir"; |
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| 49 | final static private String FILENAME = "block"; |
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| 50 | final static private LocalDirAllocator dirAllocator = |
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| 51 | new LocalDirAllocator(CONTEXT); |
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| 52 | static LocalFileSystem localFs; |
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| 53 | final static private boolean isWindows = |
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| 54 | System.getProperty("os.name").startsWith("Windows"); |
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| 55 | final static int SMALL_FILE_SIZE = 100; |
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| 56 | static { |
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| 57 | try { |
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| 58 | localFs = FileSystem.getLocal(conf); |
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| 59 | rmBufferDirs(); |
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| 60 | } catch(IOException e) { |
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| 61 | System.out.println(e.getMessage()); |
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| 62 | e.printStackTrace(); |
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| 63 | System.exit(-1); |
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| 64 | } |
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| 65 | } |
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| 66 | |
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| 67 | private static void rmBufferDirs() throws IOException { |
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| 68 | assertTrue(!localFs.exists(BUFFER_PATH_ROOT) || |
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| 69 | localFs.delete(BUFFER_PATH_ROOT)); |
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| 70 | } |
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| 71 | |
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| 72 | private void validateTempDirCreation(int i) throws IOException { |
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| 73 | File result = createTempFile(SMALL_FILE_SIZE); |
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| 74 | assertTrue("Checking for " + BUFFER_DIR[i] + " in " + result + " - FAILED!", |
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| 75 | result.getPath().startsWith(new File(BUFFER_DIR[i], FILENAME).getPath())); |
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| 76 | } |
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| 77 | |
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| 78 | private File createTempFile() throws IOException { |
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| 79 | File result = dirAllocator.createTmpFileForWrite(FILENAME, -1, conf); |
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| 80 | result.delete(); |
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| 81 | return result; |
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| 82 | } |
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| 83 | |
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| 84 | private File createTempFile(long size) throws IOException { |
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| 85 | File result = dirAllocator.createTmpFileForWrite(FILENAME, size, conf); |
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| 86 | result.delete(); |
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| 87 | return result; |
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| 88 | } |
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| 89 | |
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| 90 | /** Two buffer dirs. The first dir does not exist & is on a read-only disk; |
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| 91 | * The second dir exists & is RW |
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| 92 | * @throws Exception |
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| 93 | */ |
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| 94 | public void test0() throws Exception { |
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| 95 | if (isWindows) return; |
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| 96 | try { |
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| 97 | conf.set(CONTEXT, BUFFER_DIR[0]+","+BUFFER_DIR[1]); |
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| 98 | assertTrue(localFs.mkdirs(BUFFER_PATH[1])); |
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| 99 | BUFFER_ROOT.setReadOnly(); |
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| 100 | validateTempDirCreation(1); |
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| 101 | validateTempDirCreation(1); |
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| 102 | } finally { |
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| 103 | Shell.execCommand(new String[]{"chmod", "u+w", BUFFER_DIR_ROOT}); |
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| 104 | rmBufferDirs(); |
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| 105 | } |
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| 106 | } |
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| 107 | |
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| 108 | /** Two buffer dirs. The first dir exists & is on a read-only disk; |
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| 109 | * The second dir exists & is RW |
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| 110 | * @throws Exception |
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| 111 | */ |
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| 112 | public void test1() throws Exception { |
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| 113 | if (isWindows) return; |
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| 114 | try { |
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| 115 | conf.set(CONTEXT, BUFFER_DIR[1]+","+BUFFER_DIR[2]); |
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| 116 | assertTrue(localFs.mkdirs(BUFFER_PATH[2])); |
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| 117 | BUFFER_ROOT.setReadOnly(); |
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| 118 | validateTempDirCreation(2); |
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| 119 | validateTempDirCreation(2); |
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| 120 | } finally { |
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| 121 | Shell.execCommand(new String[]{"chmod", "u+w", BUFFER_DIR_ROOT}); |
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| 122 | rmBufferDirs(); |
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| 123 | } |
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| 124 | } |
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| 125 | /** Two buffer dirs. Both do not exist but on a RW disk. |
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| 126 | * Check if tmp dirs are allocated in a round-robin |
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| 127 | */ |
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| 128 | public void test2() throws Exception { |
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| 129 | if (isWindows) return; |
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| 130 | try { |
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| 131 | conf.set(CONTEXT, BUFFER_DIR[2]+","+BUFFER_DIR[3]); |
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| 132 | |
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| 133 | // create the first file, and then figure the round-robin sequence |
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| 134 | createTempFile(SMALL_FILE_SIZE); |
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| 135 | int firstDirIdx = (dirAllocator.getCurrentDirectoryIndex() == 0) ? 2 : 3; |
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| 136 | int secondDirIdx = (firstDirIdx == 2) ? 3 : 2; |
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| 137 | |
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| 138 | // check if tmp dirs are allocated in a round-robin manner |
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| 139 | validateTempDirCreation(firstDirIdx); |
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| 140 | validateTempDirCreation(secondDirIdx); |
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| 141 | validateTempDirCreation(firstDirIdx); |
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| 142 | } finally { |
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| 143 | rmBufferDirs(); |
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| 144 | } |
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| 145 | } |
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| 146 | |
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| 147 | /** Two buffer dirs. Both exists and on a R/W disk. |
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| 148 | * Later disk1 becomes read-only. |
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| 149 | * @throws Exception |
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| 150 | */ |
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| 151 | public void test3() throws Exception { |
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| 152 | if (isWindows) return; |
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| 153 | try { |
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| 154 | conf.set(CONTEXT, BUFFER_DIR[3]+","+BUFFER_DIR[4]); |
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| 155 | assertTrue(localFs.mkdirs(BUFFER_PATH[3])); |
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| 156 | assertTrue(localFs.mkdirs(BUFFER_PATH[4])); |
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| 157 | |
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| 158 | // create the first file with size, and then figure the round-robin sequence |
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| 159 | createTempFile(SMALL_FILE_SIZE); |
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| 160 | |
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| 161 | int nextDirIdx = (dirAllocator.getCurrentDirectoryIndex() == 0) ? 3 : 4; |
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| 162 | validateTempDirCreation(nextDirIdx); |
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| 163 | |
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| 164 | // change buffer directory 2 to be read only |
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| 165 | new File(BUFFER_DIR[4]).setReadOnly(); |
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| 166 | validateTempDirCreation(3); |
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| 167 | validateTempDirCreation(3); |
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| 168 | } finally { |
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| 169 | rmBufferDirs(); |
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| 170 | } |
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| 171 | } |
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| 172 | |
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| 173 | /** |
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| 174 | * Two buffer dirs, on read-write disk. |
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| 175 | * |
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| 176 | * Try to create a whole bunch of files. |
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| 177 | * Verify that they do indeed all get created where they should. |
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| 178 | * |
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| 179 | * Would ideally check statistical properties of distribution, but |
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| 180 | * we don't have the nerve to risk false-positives here. |
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| 181 | * |
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| 182 | * @throws Exception |
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| 183 | */ |
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| 184 | static final int TRIALS = 100; |
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| 185 | public void test4() throws Exception { |
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| 186 | if (isWindows) return; |
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| 187 | try { |
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| 188 | |
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| 189 | conf.set(CONTEXT, BUFFER_DIR[5]+","+BUFFER_DIR[6]); |
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| 190 | assertTrue(localFs.mkdirs(BUFFER_PATH[5])); |
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| 191 | assertTrue(localFs.mkdirs(BUFFER_PATH[6])); |
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| 192 | |
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| 193 | int inDir5=0, inDir6=0; |
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| 194 | for(int i = 0; i < TRIALS; ++i) { |
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| 195 | File result = createTempFile(); |
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| 196 | if(result.getPath().startsWith(new File(BUFFER_DIR[5], FILENAME).getPath())) { |
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| 197 | inDir5++; |
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| 198 | } else if(result.getPath().startsWith(new File(BUFFER_DIR[6], FILENAME).getPath())) { |
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| 199 | inDir6++; |
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| 200 | } |
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| 201 | result.delete(); |
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| 202 | } |
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| 203 | |
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| 204 | assertTrue( inDir5 + inDir6 == TRIALS); |
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| 205 | |
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| 206 | } finally { |
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| 207 | rmBufferDirs(); |
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| 208 | } |
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| 209 | } |
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| 210 | |
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| 211 | } |
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