[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one or more |
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| 3 | * contributor license agreements. See the NOTICE file distributed with this |
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| 4 | * work for additional information regarding copyright ownership. The ASF |
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| 5 | * licenses this file to you under the Apache License, Version 2.0 (the |
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| 6 | * "License"); you may not use this file except in compliance with the License. |
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| 7 | * You may obtain a copy of the License at |
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| 8 | * |
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| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 10 | * |
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| 11 | * Unless required by applicable law or agreed to in writing, software |
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| 12 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
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| 13 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
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| 14 | * License for the specific language governing permissions and limitations under |
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| 15 | * the License. |
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| 16 | */ |
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| 17 | package org.apache.hadoop.io.file.tfile; |
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| 18 | |
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| 19 | import java.io.IOException; |
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| 20 | |
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| 21 | import junit.framework.Assert; |
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| 22 | import junit.framework.TestCase; |
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| 23 | |
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| 24 | import org.apache.hadoop.conf.Configuration; |
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| 25 | import org.apache.hadoop.fs.FSDataOutputStream; |
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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.io.BytesWritable; |
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| 29 | import org.apache.hadoop.io.file.tfile.TFile.Reader; |
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| 30 | import org.apache.hadoop.io.file.tfile.TFile.Writer; |
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| 31 | import org.apache.hadoop.io.file.tfile.TFile.Reader.Scanner; |
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| 32 | |
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| 33 | public class TestTFileSplit extends TestCase { |
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| 34 | private static String ROOT = |
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| 35 | System.getProperty("test.build.data", "/tmp/tfile-test"); |
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| 36 | |
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| 37 | private final static int BLOCK_SIZE = 64 * 1024; |
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| 38 | |
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| 39 | private static final String KEY = "key"; |
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| 40 | private static final String VALUE = "value"; |
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| 41 | |
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| 42 | private FileSystem fs; |
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| 43 | private Configuration conf; |
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| 44 | private Path path; |
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| 45 | |
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| 46 | private String comparator = "memcmp"; |
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| 47 | private String outputFile = "TestTFileSplit"; |
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| 48 | |
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| 49 | void createFile(int count, String compress) throws IOException { |
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| 50 | conf = new Configuration(); |
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| 51 | path = new Path(ROOT, outputFile + "." + compress); |
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| 52 | fs = path.getFileSystem(conf); |
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| 53 | FSDataOutputStream out = fs.create(path); |
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| 54 | Writer writer = new Writer(out, BLOCK_SIZE, compress, comparator, conf); |
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| 55 | |
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| 56 | int nx; |
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| 57 | for (nx = 0; nx < count; nx++) { |
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| 58 | byte[] key = composeSortedKey(KEY, count, nx).getBytes(); |
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| 59 | byte[] value = (VALUE + nx).getBytes(); |
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| 60 | writer.append(key, value); |
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| 61 | } |
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| 62 | writer.close(); |
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| 63 | out.close(); |
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| 64 | } |
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| 65 | |
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| 66 | void readFile() throws IOException { |
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| 67 | long fileLength = fs.getFileStatus(path).getLen(); |
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| 68 | int numSplit = 10; |
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| 69 | long splitSize = fileLength / numSplit + 1; |
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| 70 | |
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| 71 | Reader reader = |
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| 72 | new Reader(fs.open(path), fs.getFileStatus(path).getLen(), conf); |
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| 73 | long offset = 0; |
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| 74 | long rowCount = 0; |
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| 75 | BytesWritable key, value; |
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| 76 | for (int i = 0; i < numSplit; ++i, offset += splitSize) { |
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| 77 | Scanner scanner = reader.createScanner(offset, splitSize); |
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| 78 | int count = 0; |
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| 79 | key = new BytesWritable(); |
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| 80 | value = new BytesWritable(); |
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| 81 | while (!scanner.atEnd()) { |
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| 82 | scanner.entry().get(key, value); |
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| 83 | ++count; |
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| 84 | scanner.advance(); |
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| 85 | } |
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| 86 | scanner.close(); |
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| 87 | Assert.assertTrue(count > 0); |
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| 88 | rowCount += count; |
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| 89 | } |
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| 90 | Assert.assertEquals(rowCount, reader.getEntryCount()); |
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| 91 | reader.close(); |
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| 92 | } |
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| 93 | |
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| 94 | static String composeSortedKey(String prefix, int total, int value) { |
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| 95 | return String.format("%s%010d", prefix, value); |
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| 96 | } |
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| 97 | |
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| 98 | public void testSplit() throws IOException { |
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| 99 | System.out.println("testSplit"); |
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| 100 | createFile(100000, Compression.Algorithm.NONE.getName()); |
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| 101 | readFile(); |
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| 102 | fs.delete(path, true); |
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| 103 | createFile(500000, Compression.Algorithm.GZ.getName()); |
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| 104 | readFile(); |
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| 105 | fs.delete(path, true); |
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| 106 | } |
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| 107 | } |
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