[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 | |
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| 19 | package org.apache.hadoop.mapred; |
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| 20 | |
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| 21 | import java.io.*; |
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| 22 | import java.util.*; |
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| 23 | import junit.framework.TestCase; |
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| 24 | |
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| 25 | import org.apache.commons.logging.*; |
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| 26 | |
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| 27 | import org.apache.hadoop.fs.*; |
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| 28 | import org.apache.hadoop.io.*; |
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| 29 | import org.apache.hadoop.conf.*; |
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| 30 | |
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| 31 | public class TestSequenceFileAsTextInputFormat extends TestCase { |
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| 32 | private static final Log LOG = FileInputFormat.LOG; |
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| 33 | |
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| 34 | private static int MAX_LENGTH = 10000; |
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| 35 | private static Configuration conf = new Configuration(); |
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| 36 | |
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| 37 | public void testFormat() throws Exception { |
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| 38 | JobConf job = new JobConf(conf); |
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| 39 | FileSystem fs = FileSystem.getLocal(conf); |
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| 40 | Path dir = new Path(System.getProperty("test.build.data",".") + "/mapred"); |
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| 41 | Path file = new Path(dir, "test.seq"); |
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| 42 | |
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| 43 | Reporter reporter = Reporter.NULL; |
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| 44 | |
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| 45 | int seed = new Random().nextInt(); |
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| 46 | //LOG.info("seed = "+seed); |
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| 47 | Random random = new Random(seed); |
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| 48 | |
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| 49 | fs.delete(dir, true); |
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| 50 | |
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| 51 | FileInputFormat.setInputPaths(job, dir); |
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| 52 | |
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| 53 | // for a variety of lengths |
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| 54 | for (int length = 0; length < MAX_LENGTH; |
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| 55 | length+= random.nextInt(MAX_LENGTH/10)+1) { |
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| 56 | |
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| 57 | //LOG.info("creating; entries = " + length); |
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| 58 | |
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| 59 | // create a file with length entries |
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| 60 | SequenceFile.Writer writer = |
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| 61 | SequenceFile.createWriter(fs, conf, file, |
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| 62 | IntWritable.class, LongWritable.class); |
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| 63 | try { |
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| 64 | for (int i = 0; i < length; i++) { |
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| 65 | IntWritable key = new IntWritable(i); |
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| 66 | LongWritable value = new LongWritable(10 * i); |
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| 67 | writer.append(key, value); |
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| 68 | } |
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| 69 | } finally { |
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| 70 | writer.close(); |
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| 71 | } |
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| 72 | |
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| 73 | // try splitting the file in a variety of sizes |
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| 74 | InputFormat<Text, Text> format = |
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| 75 | new SequenceFileAsTextInputFormat(); |
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| 76 | |
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| 77 | for (int i = 0; i < 3; i++) { |
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| 78 | int numSplits = |
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| 79 | random.nextInt(MAX_LENGTH/(SequenceFile.SYNC_INTERVAL/20))+1; |
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| 80 | //LOG.info("splitting: requesting = " + numSplits); |
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| 81 | InputSplit[] splits = format.getSplits(job, numSplits); |
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| 82 | //LOG.info("splitting: got = " + splits.length); |
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| 83 | |
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| 84 | // check each split |
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| 85 | BitSet bits = new BitSet(length); |
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| 86 | for (int j = 0; j < splits.length; j++) { |
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| 87 | RecordReader<Text, Text> reader = |
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| 88 | format.getRecordReader(splits[j], job, reporter); |
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| 89 | Class readerClass = reader.getClass(); |
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| 90 | assertEquals("reader class is SequenceFileAsTextRecordReader.", SequenceFileAsTextRecordReader.class, readerClass); |
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| 91 | Text value = reader.createValue(); |
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| 92 | Text key = reader.createKey(); |
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| 93 | try { |
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| 94 | int count = 0; |
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| 95 | while (reader.next(key, value)) { |
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| 96 | // if (bits.get(key.get())) { |
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| 97 | // LOG.info("splits["+j+"]="+splits[j]+" : " + key.get()); |
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| 98 | // LOG.info("@"+reader.getPos()); |
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| 99 | // } |
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| 100 | int keyInt = Integer.parseInt(key.toString()); |
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| 101 | assertFalse("Key in multiple partitions.", bits.get(keyInt)); |
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| 102 | bits.set(keyInt); |
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| 103 | count++; |
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| 104 | } |
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| 105 | //LOG.info("splits["+j+"]="+splits[j]+" count=" + count); |
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| 106 | } finally { |
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| 107 | reader.close(); |
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| 108 | } |
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| 109 | } |
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| 110 | assertEquals("Some keys in no partition.", length, bits.cardinality()); |
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| 111 | } |
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| 112 | |
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| 113 | } |
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| 114 | } |
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| 115 | |
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| 116 | public static void main(String[] args) throws Exception { |
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| 117 | new TestSequenceFileAsTextInputFormat().testFormat(); |
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| 118 | } |
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| 119 | } |
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