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.hdfs; |
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20 | |
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21 | import java.io.BufferedReader; |
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22 | import java.io.ByteArrayOutputStream; |
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23 | import java.io.File; |
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24 | import java.io.FileReader; |
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25 | import java.io.IOException; |
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26 | import java.net.URL; |
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27 | import java.net.URLConnection; |
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28 | import java.util.Random; |
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29 | import junit.framework.TestCase; |
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30 | import org.apache.hadoop.hdfs.DFSClient.DFSDataInputStream; |
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31 | import org.apache.hadoop.hdfs.protocol.Block; |
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32 | import org.apache.hadoop.io.IOUtils; |
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33 | import org.apache.hadoop.fs.FSDataInputStream; |
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34 | import org.apache.hadoop.fs.FSDataOutputStream; |
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35 | import org.apache.hadoop.fs.FileSystem; |
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36 | import org.apache.hadoop.fs.Path; |
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37 | import org.apache.hadoop.fs.BlockLocation; |
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38 | |
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39 | /** |
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40 | */ |
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41 | public class DFSTestUtil extends TestCase { |
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42 | |
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43 | private static Random gen = new Random(); |
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44 | private static String[] dirNames = { |
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45 | "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" |
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46 | }; |
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47 | |
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48 | private int maxLevels;// = 3; |
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49 | private int maxSize;// = 8*1024; |
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50 | private int nFiles; |
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51 | private MyFile[] files; |
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52 | |
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53 | /** Creates a new instance of DFSTestUtil |
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54 | * |
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55 | * @param testName Name of the test from where this utility is used |
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56 | * @param nFiles Number of files to be created |
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57 | * @param maxLevels Maximum number of directory levels |
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58 | * @param maxSize Maximum size for file |
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59 | */ |
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60 | public DFSTestUtil(String testName, int nFiles, int maxLevels, int maxSize) { |
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61 | this.nFiles = nFiles; |
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62 | this.maxLevels = maxLevels; |
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63 | this.maxSize = maxSize; |
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64 | } |
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65 | |
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66 | /** class MyFile contains enough information to recreate the contents of |
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67 | * a single file. |
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68 | */ |
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69 | private class MyFile { |
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70 | |
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71 | private String name = ""; |
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72 | private int size; |
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73 | private long seed; |
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74 | |
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75 | MyFile() { |
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76 | int nLevels = gen.nextInt(maxLevels); |
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77 | if (nLevels != 0) { |
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78 | int[] levels = new int[nLevels]; |
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79 | for (int idx = 0; idx < nLevels; idx++) { |
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80 | levels[idx] = gen.nextInt(10); |
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81 | } |
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82 | StringBuffer sb = new StringBuffer(); |
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83 | for (int idx = 0; idx < nLevels; idx++) { |
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84 | sb.append(dirNames[levels[idx]]); |
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85 | sb.append("/"); |
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86 | } |
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87 | name = sb.toString(); |
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88 | } |
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89 | long fidx = -1; |
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90 | while (fidx < 0) { fidx = gen.nextLong(); } |
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91 | name = name + Long.toString(fidx); |
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92 | size = gen.nextInt(maxSize); |
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93 | seed = gen.nextLong(); |
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94 | } |
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95 | |
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96 | String getName() { return name; } |
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97 | int getSize() { return size; } |
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98 | long getSeed() { return seed; } |
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99 | } |
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100 | |
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101 | public void createFiles(FileSystem fs, String topdir) throws IOException { |
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102 | createFiles(fs, topdir, (short)3); |
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103 | } |
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104 | |
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105 | /** create nFiles with random names and directory hierarchies |
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106 | * with random (but reproducible) data in them. |
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107 | */ |
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108 | void createFiles(FileSystem fs, String topdir, |
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109 | short replicationFactor) throws IOException { |
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110 | files = new MyFile[nFiles]; |
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111 | |
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112 | for (int idx = 0; idx < nFiles; idx++) { |
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113 | files[idx] = new MyFile(); |
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114 | } |
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115 | |
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116 | Path root = new Path(topdir); |
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117 | |
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118 | for (int idx = 0; idx < nFiles; idx++) { |
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119 | createFile(fs, new Path(root, files[idx].getName()), files[idx].getSize(), |
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120 | replicationFactor, files[idx].getSeed()); |
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121 | } |
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122 | } |
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123 | |
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124 | public static void createFile(FileSystem fs, Path fileName, long fileLen, |
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125 | short replFactor, long seed) throws IOException { |
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126 | if (!fs.mkdirs(fileName.getParent())) { |
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127 | throw new IOException("Mkdirs failed to create " + |
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128 | fileName.getParent().toString()); |
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129 | } |
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130 | FSDataOutputStream out = null; |
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131 | try { |
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132 | out = fs.create(fileName, replFactor); |
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133 | byte[] toWrite = new byte[1024]; |
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134 | Random rb = new Random(seed); |
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135 | long bytesToWrite = fileLen; |
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136 | while (bytesToWrite>0) { |
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137 | rb.nextBytes(toWrite); |
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138 | int bytesToWriteNext = (1024<bytesToWrite)?1024:(int)bytesToWrite; |
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139 | |
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140 | out.write(toWrite, 0, bytesToWriteNext); |
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141 | bytesToWrite -= bytesToWriteNext; |
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142 | } |
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143 | out.close(); |
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144 | out = null; |
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145 | } finally { |
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146 | IOUtils.closeStream(out); |
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147 | } |
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148 | } |
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149 | |
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150 | /** check if the files have been copied correctly. */ |
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151 | public boolean checkFiles(FileSystem fs, String topdir) throws IOException { |
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152 | |
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153 | //Configuration conf = new Configuration(); |
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154 | Path root = new Path(topdir); |
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155 | |
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156 | for (int idx = 0; idx < nFiles; idx++) { |
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157 | Path fPath = new Path(root, files[idx].getName()); |
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158 | FSDataInputStream in = fs.open(fPath); |
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159 | byte[] toRead = new byte[files[idx].getSize()]; |
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160 | byte[] toCompare = new byte[files[idx].getSize()]; |
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161 | Random rb = new Random(files[idx].getSeed()); |
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162 | rb.nextBytes(toCompare); |
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163 | in.readFully(0, toRead); |
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164 | in.close(); |
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165 | for (int i = 0; i < toRead.length; i++) { |
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166 | if (toRead[i] != toCompare[i]) { |
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167 | return false; |
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168 | } |
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169 | } |
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170 | toRead = null; |
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171 | toCompare = null; |
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172 | } |
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173 | |
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174 | return true; |
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175 | } |
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176 | |
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177 | void setReplication(FileSystem fs, String topdir, short value) |
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178 | throws IOException { |
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179 | Path root = new Path(topdir); |
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180 | for (int idx = 0; idx < nFiles; idx++) { |
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181 | Path fPath = new Path(root, files[idx].getName()); |
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182 | fs.setReplication(fPath, value); |
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183 | } |
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184 | } |
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185 | |
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186 | // waits for the replication factor of all files to reach the |
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187 | // specified target |
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188 | // |
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189 | public void waitReplication(FileSystem fs, String topdir, short value) |
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190 | throws IOException { |
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191 | Path root = new Path(topdir); |
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192 | |
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193 | /** wait for the replication factor to settle down */ |
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194 | for (int idx = 0; idx < nFiles; idx++) { |
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195 | waitReplication(fs, new Path(root, files[idx].getName()), value); |
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196 | } |
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197 | } |
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198 | |
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199 | /** return list of filenames created as part of createFiles */ |
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200 | public String[] getFileNames(String topDir) { |
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201 | if (nFiles == 0) |
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202 | return new String[]{}; |
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203 | else { |
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204 | String[] fileNames = new String[nFiles]; |
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205 | for (int idx=0; idx < nFiles; idx++) { |
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206 | fileNames[idx] = topDir + "/" + files[idx].getName(); |
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207 | } |
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208 | return fileNames; |
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209 | } |
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210 | } |
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211 | |
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212 | /** wait for the file's replication to be done */ |
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213 | public static void waitReplication(FileSystem fs, Path fileName, |
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214 | short replFactor) throws IOException { |
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215 | boolean good; |
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216 | do { |
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217 | good = true; |
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218 | BlockLocation locs[] = fs.getFileBlockLocations( |
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219 | fs.getFileStatus(fileName), 0, Long.MAX_VALUE); |
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220 | for (int j = 0; j < locs.length; j++) { |
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221 | String[] loc = locs[j].getHosts(); |
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222 | if (loc.length != replFactor) { |
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223 | System.out.println("File " + fileName + " has replication factor " + |
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224 | loc.length); |
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225 | good = false; |
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226 | try { |
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227 | System.out.println("Waiting for replication factor to drain"); |
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228 | Thread.sleep(100); |
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229 | } catch (InterruptedException e) {} |
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230 | break; |
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231 | } |
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232 | } |
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233 | } while(!good); |
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234 | } |
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235 | |
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236 | /** delete directory and everything underneath it.*/ |
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237 | public void cleanup(FileSystem fs, String topdir) throws IOException { |
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238 | Path root = new Path(topdir); |
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239 | fs.delete(root, true); |
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240 | files = null; |
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241 | } |
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242 | |
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243 | public static Block getFirstBlock(FileSystem fs, Path path) throws IOException { |
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244 | DFSDataInputStream in = |
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245 | (DFSDataInputStream) ((DistributedFileSystem)fs).open(path); |
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246 | in.readByte(); |
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247 | return in.getCurrentBlock(); |
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248 | } |
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249 | |
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250 | static void setLogLevel2All(org.apache.commons.logging.Log log) { |
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251 | ((org.apache.commons.logging.impl.Log4JLogger)log |
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252 | ).getLogger().setLevel(org.apache.log4j.Level.ALL); |
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253 | } |
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254 | |
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255 | static String readFile(File f) throws IOException { |
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256 | StringBuilder b = new StringBuilder(); |
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257 | BufferedReader in = new BufferedReader(new FileReader(f)); |
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258 | for(int c; (c = in.read()) != -1; b.append((char)c)); |
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259 | in.close(); |
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260 | return b.toString(); |
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261 | } |
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262 | |
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263 | // Returns url content as string. |
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264 | public static String urlGet(URL url) throws IOException { |
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265 | URLConnection conn = url.openConnection(); |
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266 | ByteArrayOutputStream out = new ByteArrayOutputStream(); |
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267 | IOUtils.copyBytes(conn.getInputStream(), out, 4096, true); |
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268 | return out.toString(); |
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269 | } |
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270 | } |
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