[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 | 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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