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.hdfs.server.namenode; |
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19 | |
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20 | import junit.framework.TestCase; |
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21 | import java.io.*; |
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22 | import java.net.*; |
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23 | import java.util.Random; |
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24 | |
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25 | import org.apache.hadoop.conf.Configuration; |
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26 | import org.apache.hadoop.fs.FsShell; |
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27 | import org.apache.hadoop.fs.FileSystem; |
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28 | import org.apache.hadoop.fs.Path; |
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29 | import org.apache.hadoop.util.StringUtils; |
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30 | import org.apache.hadoop.fs.FSDataOutputStream; |
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31 | import org.apache.hadoop.fs.FSDataInputStream; |
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32 | import org.apache.hadoop.hdfs.MiniDFSCluster; |
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33 | import org.apache.hadoop.hdfs.protocol.FSConstants.DatanodeReportType; |
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34 | import org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset; |
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35 | |
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36 | |
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37 | /** |
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38 | * This class tests that a file system adheres to the limit of |
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39 | * maximum number of files that is configured. |
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40 | */ |
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41 | public class TestFileLimit extends TestCase { |
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42 | static final long seed = 0xDEADBEEFL; |
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43 | static final int blockSize = 8192; |
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44 | boolean simulatedStorage = false; |
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45 | |
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46 | // The test file is 2 times the blocksize plus one. This means that when the |
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47 | // entire file is written, the first two blocks definitely get flushed to |
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48 | // the datanodes. |
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49 | |
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50 | private static String TEST_ROOT_DIR = |
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51 | new Path(System.getProperty("test.build.data","/tmp")) |
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52 | .toString().replace(' ', '+'); |
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53 | |
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54 | // |
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55 | // creates a zero file. |
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56 | // |
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57 | private void createFile(FileSystem fileSys, Path name) |
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58 | throws IOException { |
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59 | FSDataOutputStream stm = fileSys.create(name, true, |
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60 | fileSys.getConf().getInt("io.file.buffer.size", 4096), |
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61 | (short)1, (long)blockSize); |
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62 | byte[] buffer = new byte[1024]; |
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63 | Random rand = new Random(seed); |
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64 | rand.nextBytes(buffer); |
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65 | stm.write(buffer); |
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66 | stm.close(); |
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67 | } |
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68 | |
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69 | private void waitForLimit(FSNamesystem namesys, long num) |
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70 | { |
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71 | // wait for number of blocks to decrease |
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72 | while (true) { |
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73 | long total = namesys.getBlocksTotal() + namesys.dir.totalInodes(); |
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74 | System.out.println("Comparing current nodes " + total + |
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75 | " to become " + num); |
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76 | if (total == num) { |
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77 | break; |
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78 | } |
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79 | try { |
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80 | Thread.sleep(1000); |
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81 | } catch (InterruptedException e) { |
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82 | } |
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83 | } |
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84 | } |
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85 | |
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86 | /** |
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87 | * Test that file data becomes available before file is closed. |
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88 | */ |
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89 | public void testFileLimit() throws IOException { |
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90 | Configuration conf = new Configuration(); |
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91 | int maxObjects = 5; |
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92 | conf.setLong("dfs.max.objects", maxObjects); |
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93 | conf.setLong("dfs.blockreport.intervalMsec", 1000L); |
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94 | conf.setInt("dfs.heartbeat.interval", 1); |
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95 | int currentNodes = 0; |
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96 | |
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97 | if (simulatedStorage) { |
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98 | conf.setBoolean(SimulatedFSDataset.CONFIG_PROPERTY_SIMULATED, true); |
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99 | } |
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100 | MiniDFSCluster cluster = new MiniDFSCluster(conf, 1, true, null); |
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101 | FileSystem fs = cluster.getFileSystem(); |
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102 | FSNamesystem namesys = FSNamesystem.fsNamesystemObject; |
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103 | NameNode namenode = cluster.getNameNode(); |
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104 | try { |
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105 | |
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106 | // |
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107 | // check that / exists |
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108 | // |
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109 | Path path = new Path("/"); |
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110 | assertTrue("/ should be a directory", |
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111 | fs.getFileStatus(path).isDir() == true); |
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112 | currentNodes = 1; // root inode |
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113 | |
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114 | // verify that we can create the specified number of files. We leave |
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115 | // one for the "/". Each file takes an inode and a block. |
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116 | // |
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117 | for (int i = 0; i < maxObjects/2; i++) { |
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118 | Path file = new Path("/filestatus" + i); |
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119 | createFile(fs, file); |
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120 | System.out.println("Created file " + file); |
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121 | currentNodes += 2; // two more objects for this creation. |
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122 | } |
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123 | |
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124 | // verify that creating another file fails |
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125 | boolean hitException = false; |
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126 | try { |
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127 | Path file = new Path("/filestatus"); |
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128 | createFile(fs, file); |
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129 | System.out.println("Created file " + file); |
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130 | } catch (IOException e) { |
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131 | hitException = true; |
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132 | } |
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133 | assertTrue("Was able to exceed file limit", hitException); |
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134 | |
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135 | // delete one file |
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136 | Path file0 = new Path("/filestatus0"); |
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137 | fs.delete(file0, true); |
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138 | System.out.println("Deleted file " + file0); |
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139 | currentNodes -= 2; |
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140 | |
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141 | // wait for number of blocks to decrease |
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142 | waitForLimit(namesys, currentNodes); |
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143 | |
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144 | // now, we shud be able to create a new file |
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145 | createFile(fs, file0); |
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146 | System.out.println("Created file " + file0 + " again."); |
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147 | currentNodes += 2; |
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148 | |
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149 | // delete the file again |
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150 | file0 = new Path("/filestatus0"); |
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151 | fs.delete(file0, true); |
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152 | System.out.println("Deleted file " + file0 + " again."); |
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153 | currentNodes -= 2; |
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154 | |
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155 | // wait for number of blocks to decrease |
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156 | waitForLimit(namesys, currentNodes); |
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157 | |
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158 | // create two directories in place of the file that we deleted |
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159 | Path dir = new Path("/dir0/dir1"); |
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160 | fs.mkdirs(dir); |
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161 | System.out.println("Created directories " + dir); |
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162 | currentNodes += 2; |
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163 | waitForLimit(namesys, currentNodes); |
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164 | |
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165 | // verify that creating another directory fails |
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166 | hitException = false; |
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167 | try { |
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168 | fs.mkdirs(new Path("dir.fail")); |
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169 | System.out.println("Created directory should not have succeeded."); |
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170 | } catch (IOException e) { |
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171 | hitException = true; |
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172 | } |
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173 | assertTrue("Was able to exceed dir limit", hitException); |
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174 | |
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175 | } finally { |
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176 | fs.close(); |
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177 | cluster.shutdown(); |
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178 | } |
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179 | } |
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180 | |
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181 | public void testFileLimitSimulated() throws IOException { |
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182 | simulatedStorage = true; |
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183 | testFileLimit(); |
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184 | simulatedStorage = false; |
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185 | } |
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186 | } |
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