[120] | 1 | /** |
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| 2 | * Copyright 2007 The Apache Software Foundation |
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| 3 | * |
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| 4 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 5 | * or more contributor license agreements. See the NOTICE file |
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| 6 | * distributed with this work for additional information |
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| 7 | * regarding copyright ownership. The ASF licenses this file |
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| 8 | * to you under the Apache License, Version 2.0 (the |
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| 9 | * "License"); you may not use this file except in compliance |
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| 10 | * with the License. You may obtain a copy of the License at |
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| 11 | * |
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| 12 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 13 | * |
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| 14 | * Unless required by applicable law or agreed to in writing, software |
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| 15 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 17 | * See the License for the specific language governing permissions and |
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| 18 | * limitations under the License. |
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| 19 | */ |
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| 20 | package org.apache.hadoop.io; |
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| 21 | |
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| 22 | import org.apache.hadoop.conf.Configuration; |
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| 23 | import org.apache.hadoop.fs.FileSystem; |
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| 24 | import org.apache.hadoop.fs.Path; |
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| 25 | |
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| 26 | import junit.framework.TestCase; |
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| 27 | |
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| 28 | public class TestMapFile extends TestCase { |
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| 29 | private static Configuration conf = new Configuration(); |
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| 30 | |
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| 31 | /** |
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| 32 | * Test getClosest feature. |
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| 33 | * @throws Exception |
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| 34 | */ |
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| 35 | public void testGetClosest() throws Exception { |
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| 36 | // Write a mapfile of simple data: keys are |
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| 37 | Path dirName = new Path(System.getProperty("test.build.data",".") + |
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| 38 | getName() + ".mapfile"); |
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| 39 | FileSystem fs = FileSystem.getLocal(conf); |
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| 40 | Path qualifiedDirName = fs.makeQualified(dirName); |
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| 41 | // Make an index entry for every third insertion. |
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| 42 | MapFile.Writer.setIndexInterval(conf, 3); |
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| 43 | MapFile.Writer writer = new MapFile.Writer(conf, fs, |
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| 44 | qualifiedDirName.toString(), Text.class, Text.class); |
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| 45 | // Assert that the index interval is 1 |
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| 46 | assertEquals(3, writer.getIndexInterval()); |
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| 47 | // Add entries up to 100 in intervals of ten. |
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| 48 | final int FIRST_KEY = 10; |
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| 49 | for (int i = FIRST_KEY; i < 100; i += 10) { |
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| 50 | String iStr = Integer.toString(i); |
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| 51 | Text t = new Text("00".substring(iStr.length()) + iStr); |
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| 52 | writer.append(t, t); |
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| 53 | } |
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| 54 | writer.close(); |
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| 55 | // Now do getClosest on created mapfile. |
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| 56 | MapFile.Reader reader = new MapFile.Reader(fs, qualifiedDirName.toString(), |
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| 57 | conf); |
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| 58 | Text key = new Text("55"); |
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| 59 | Text value = new Text(); |
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| 60 | Text closest = (Text)reader.getClosest(key, value); |
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| 61 | // Assert that closest after 55 is 60 |
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| 62 | assertEquals(new Text("60"), closest); |
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| 63 | // Get closest that falls before the passed key: 50 |
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| 64 | closest = (Text)reader.getClosest(key, value, true); |
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| 65 | assertEquals(new Text("50"), closest); |
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| 66 | // Test get closest when we pass explicit key |
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| 67 | final Text TWENTY = new Text("20"); |
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| 68 | closest = (Text)reader.getClosest(TWENTY, value); |
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| 69 | assertEquals(TWENTY, closest); |
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| 70 | closest = (Text)reader.getClosest(TWENTY, value, true); |
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| 71 | assertEquals(TWENTY, closest); |
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| 72 | // Test what happens at boundaries. Assert if searching a key that is |
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| 73 | // less than first key in the mapfile, that the first key is returned. |
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| 74 | key = new Text("00"); |
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| 75 | closest = (Text)reader.getClosest(key, value); |
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| 76 | assertEquals(FIRST_KEY, Integer.parseInt(closest.toString())); |
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| 77 | |
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| 78 | // If we're looking for the first key before, and we pass in a key before |
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| 79 | // the first key in the file, we should get null |
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| 80 | closest = (Text)reader.getClosest(key, value, true); |
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| 81 | assertNull(closest); |
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| 82 | |
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| 83 | // Assert that null is returned if key is > last entry in mapfile. |
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| 84 | key = new Text("99"); |
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| 85 | closest = (Text)reader.getClosest(key, value); |
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| 86 | assertNull(closest); |
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| 87 | |
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| 88 | // If we were looking for the key before, we should get the last key |
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| 89 | closest = (Text)reader.getClosest(key, value, true); |
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| 90 | assertEquals(new Text("90"), closest); |
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| 91 | } |
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| 92 | } |
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