[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.mapred; |
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| 19 | |
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| 20 | import java.io.DataOutputStream; |
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| 21 | import java.io.FileNotFoundException; |
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| 22 | import java.io.IOException; |
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| 23 | import java.util.Random; |
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| 24 | import java.util.zip.CRC32; |
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| 25 | import java.util.zip.CheckedOutputStream; |
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| 26 | |
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| 27 | import org.apache.hadoop.fs.ChecksumException; |
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| 28 | import org.apache.hadoop.fs.FileStatus; |
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| 29 | import org.apache.hadoop.fs.FileSystem; |
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| 30 | import org.apache.hadoop.fs.Path; |
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| 31 | import org.apache.hadoop.fs.FSDataOutputStream; |
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| 32 | |
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| 33 | import junit.framework.TestCase; |
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| 34 | |
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| 35 | public class TestIndexCache extends TestCase { |
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| 36 | |
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| 37 | public void testLRCPolicy() throws Exception { |
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| 38 | Random r = new Random(); |
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| 39 | long seed = r.nextLong(); |
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| 40 | r.setSeed(seed); |
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| 41 | System.out.println("seed: " + seed); |
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| 42 | JobConf conf = new JobConf(); |
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| 43 | FileSystem fs = FileSystem.getLocal(conf).getRaw(); |
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| 44 | Path p = new Path(System.getProperty("test.build.data", "/tmp"), |
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| 45 | "cache").makeQualified(fs); |
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| 46 | fs.delete(p, true); |
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| 47 | conf.setInt("mapred.tasktracker.indexcache.mb", 1); |
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| 48 | final int partsPerMap = 1000; |
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| 49 | final int bytesPerFile = partsPerMap * 24; |
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| 50 | IndexCache cache = new IndexCache(conf); |
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| 51 | |
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| 52 | // fill cache |
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| 53 | int totalsize = bytesPerFile; |
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| 54 | for (; totalsize < 1024 * 1024; totalsize += bytesPerFile) { |
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| 55 | Path f = new Path(p, Integer.toString(totalsize, 36)); |
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| 56 | writeFile(fs, f, totalsize, partsPerMap); |
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| 57 | IndexRecord rec = cache.getIndexInformation( |
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| 58 | Integer.toString(totalsize, 36), r.nextInt(partsPerMap), f); |
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| 59 | checkRecord(rec, totalsize); |
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| 60 | } |
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| 61 | |
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| 62 | // delete files, ensure cache retains all elem |
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| 63 | for (FileStatus stat : fs.listStatus(p)) { |
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| 64 | fs.delete(stat.getPath(),true); |
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| 65 | } |
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| 66 | for (int i = bytesPerFile; i < 1024 * 1024; i += bytesPerFile) { |
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| 67 | Path f = new Path(p, Integer.toString(i, 36)); |
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| 68 | IndexRecord rec = cache.getIndexInformation(Integer.toString(i, 36), |
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| 69 | r.nextInt(partsPerMap), f); |
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| 70 | checkRecord(rec, i); |
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| 71 | } |
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| 72 | |
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| 73 | // push oldest (bytesPerFile) out of cache |
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| 74 | Path f = new Path(p, Integer.toString(totalsize, 36)); |
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| 75 | writeFile(fs, f, totalsize, partsPerMap); |
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| 76 | cache.getIndexInformation(Integer.toString(totalsize, 36), |
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| 77 | r.nextInt(partsPerMap), f); |
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| 78 | fs.delete(f, false); |
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| 79 | |
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| 80 | // oldest fails to read, or error |
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| 81 | boolean fnf = false; |
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| 82 | try { |
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| 83 | cache.getIndexInformation(Integer.toString(bytesPerFile, 36), |
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| 84 | r.nextInt(partsPerMap), new Path(p, Integer.toString(bytesPerFile))); |
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| 85 | } catch (IOException e) { |
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| 86 | if (e.getCause() == null || |
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| 87 | !(e.getCause() instanceof FileNotFoundException)) { |
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| 88 | throw e; |
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| 89 | } |
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| 90 | else { |
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| 91 | fnf = true; |
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| 92 | } |
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| 93 | } |
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| 94 | if (!fnf) |
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| 95 | fail("Failed to push out last entry"); |
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| 96 | // should find all the other entries |
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| 97 | for (int i = bytesPerFile << 1; i < 1024 * 1024; i += bytesPerFile) { |
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| 98 | IndexRecord rec = cache.getIndexInformation(Integer.toString(i, 36), |
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| 99 | r.nextInt(partsPerMap), new Path(p, Integer.toString(i, 36))); |
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| 100 | checkRecord(rec, i); |
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| 101 | } |
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| 102 | IndexRecord rec = cache.getIndexInformation(Integer.toString(totalsize, 36), |
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| 103 | r.nextInt(partsPerMap), f); |
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| 104 | checkRecord(rec, totalsize); |
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| 105 | } |
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| 106 | |
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| 107 | public void testBadIndex() throws Exception { |
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| 108 | final int parts = 30; |
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| 109 | JobConf conf = new JobConf(); |
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| 110 | FileSystem fs = FileSystem.getLocal(conf).getRaw(); |
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| 111 | Path p = new Path(System.getProperty("test.build.data", "/tmp"), |
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| 112 | "cache").makeQualified(fs); |
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| 113 | fs.delete(p, true); |
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| 114 | conf.setInt("mapred.tasktracker.indexcache.mb", 1); |
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| 115 | IndexCache cache = new IndexCache(conf); |
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| 116 | |
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| 117 | Path f = new Path(p, "badindex"); |
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| 118 | FSDataOutputStream out = fs.create(f, false); |
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| 119 | CheckedOutputStream iout = new CheckedOutputStream(out, new CRC32()); |
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| 120 | DataOutputStream dout = new DataOutputStream(iout); |
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| 121 | for (int i = 0; i < parts; ++i) { |
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| 122 | for (int j = 0; j < MapTask.MAP_OUTPUT_INDEX_RECORD_LENGTH / 8; ++j) { |
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| 123 | if (0 == (i % 3)) { |
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| 124 | dout.writeLong(i); |
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| 125 | } else { |
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| 126 | out.writeLong(i); |
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| 127 | } |
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| 128 | } |
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| 129 | } |
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| 130 | out.writeLong(iout.getChecksum().getValue()); |
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| 131 | dout.close(); |
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| 132 | try { |
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| 133 | cache.getIndexInformation("badindex", 7, f); |
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| 134 | fail("Did not detect bad checksum"); |
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| 135 | } catch (IOException e) { |
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| 136 | if (!(e.getCause() instanceof ChecksumException)) { |
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| 137 | throw e; |
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| 138 | } |
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| 139 | } |
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| 140 | } |
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| 141 | |
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| 142 | private static void checkRecord(IndexRecord rec, long fill) { |
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| 143 | assertEquals(fill, rec.startOffset); |
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| 144 | assertEquals(fill, rec.rawLength); |
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| 145 | assertEquals(fill, rec.partLength); |
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| 146 | } |
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| 147 | |
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| 148 | private static void writeFile(FileSystem fs, Path f, long fill, int parts) |
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| 149 | throws IOException { |
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| 150 | FSDataOutputStream out = fs.create(f, false); |
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| 151 | CheckedOutputStream iout = new CheckedOutputStream(out, new CRC32()); |
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| 152 | DataOutputStream dout = new DataOutputStream(iout); |
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| 153 | for (int i = 0; i < parts; ++i) { |
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| 154 | for (int j = 0; j < MapTask.MAP_OUTPUT_INDEX_RECORD_LENGTH / 8; ++j) { |
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| 155 | dout.writeLong(fill); |
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| 156 | } |
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| 157 | } |
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| 158 | out.writeLong(iout.getChecksum().getValue()); |
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| 159 | dout.close(); |
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| 160 | } |
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| 161 | } |
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