[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 | |
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| 22 | import junit.framework.TestCase; |
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| 23 | |
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| 24 | import org.apache.hadoop.fs.BlockLocation; |
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| 25 | import org.apache.hadoop.fs.FileStatus; |
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| 26 | import org.apache.hadoop.fs.FileSystem; |
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| 27 | import org.apache.hadoop.fs.Path; |
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| 28 | import org.apache.hadoop.hdfs.MiniDFSCluster; |
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| 29 | |
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| 30 | public class TestFileInputFormat extends TestCase { |
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| 31 | |
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| 32 | public void testLocality() throws Exception { |
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| 33 | JobConf conf = new JobConf(); |
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| 34 | MiniDFSCluster dfs = null; |
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| 35 | try { |
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| 36 | dfs = new MiniDFSCluster(conf, 4, true, |
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| 37 | new String[]{"/rack0", "/rack0", |
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| 38 | "/rack1", "/rack1"}, |
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| 39 | new String[]{"host0", "host1", |
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| 40 | "host2", "host3"}); |
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| 41 | FileSystem fs = dfs.getFileSystem(); |
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| 42 | System.out.println("FileSystem " + fs.getUri()); |
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| 43 | Path path = new Path("/foo/bar"); |
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| 44 | // create a multi-block file on hdfs |
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| 45 | DataOutputStream out = fs.create(path, true, 4096, |
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| 46 | (short) 2, 512, null); |
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| 47 | for(int i=0; i < 1000; ++i) { |
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| 48 | out.writeChars("Hello\n"); |
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| 49 | } |
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| 50 | out.close(); |
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| 51 | System.out.println("Wrote file"); |
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| 52 | |
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| 53 | // split it using a file input format |
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| 54 | TextInputFormat.addInputPath(conf, path); |
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| 55 | TextInputFormat inFormat = new TextInputFormat(); |
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| 56 | inFormat.configure(conf); |
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| 57 | InputSplit[] splits = inFormat.getSplits(conf, 1); |
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| 58 | FileStatus fileStatus = fs.getFileStatus(path); |
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| 59 | BlockLocation[] locations = |
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| 60 | fs.getFileBlockLocations(fileStatus, 0, fileStatus.getLen()); |
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| 61 | System.out.println("Made splits"); |
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| 62 | |
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| 63 | // make sure that each split is a block and the locations match |
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| 64 | for(int i=0; i < splits.length; ++i) { |
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| 65 | FileSplit fileSplit = (FileSplit) splits[i]; |
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| 66 | System.out.println("File split: " + fileSplit); |
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| 67 | for (String h: fileSplit.getLocations()) { |
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| 68 | System.out.println("Location: " + h); |
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| 69 | } |
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| 70 | System.out.println("Block: " + locations[i]); |
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| 71 | assertEquals(locations[i].getOffset(), fileSplit.getStart()); |
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| 72 | assertEquals(locations[i].getLength(), fileSplit.getLength()); |
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| 73 | String[] blockLocs = locations[i].getHosts(); |
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| 74 | String[] splitLocs = fileSplit.getLocations(); |
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| 75 | assertEquals(2, blockLocs.length); |
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| 76 | assertEquals(2, splitLocs.length); |
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| 77 | assertTrue((blockLocs[0].equals(splitLocs[0]) && |
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| 78 | blockLocs[1].equals(splitLocs[1])) || |
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| 79 | (blockLocs[1].equals(splitLocs[0]) && |
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| 80 | blockLocs[0].equals(splitLocs[1]))); |
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| 81 | } |
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| 82 | } finally { |
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| 83 | if (dfs != null) { |
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| 84 | dfs.shutdown(); |
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| 85 | } |
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| 86 | } |
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| 87 | } |
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| 88 | |
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| 89 | } |
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