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; |
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19 | |
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20 | import java.util.ConcurrentModificationException; |
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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.Path; |
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24 | import org.apache.hadoop.hdfs.server.namenode.FSNamesystem; |
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25 | |
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26 | /** |
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27 | * Test empty file creation. |
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28 | */ |
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29 | public class TestFileCreationEmpty extends junit.framework.TestCase { |
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30 | private boolean isConcurrentModificationException = false; |
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31 | |
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32 | /** |
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33 | * This test creates three empty files and lets their leases expire. |
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34 | * This triggers release of the leases. |
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35 | * The empty files are supposed to be closed by that |
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36 | * without causing ConcurrentModificationException. |
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37 | */ |
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38 | public void testLeaseExpireEmptyFiles() throws Exception { |
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39 | final Thread.UncaughtExceptionHandler oldUEH = Thread.getDefaultUncaughtExceptionHandler(); |
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40 | Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() { |
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41 | public void uncaughtException(Thread t, Throwable e) { |
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42 | if (e instanceof ConcurrentModificationException) { |
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43 | FSNamesystem.LOG.error("t=" + t, e); |
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44 | isConcurrentModificationException = true; |
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45 | } |
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46 | } |
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47 | }); |
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48 | |
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49 | System.out.println("testLeaseExpireEmptyFiles start"); |
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50 | final long leasePeriod = 1000; |
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51 | final int DATANODE_NUM = 3; |
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52 | |
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53 | final Configuration conf = new Configuration(); |
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54 | conf.setInt("heartbeat.recheck.interval", 1000); |
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55 | conf.setInt("dfs.heartbeat.interval", 1); |
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56 | |
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57 | // create cluster |
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58 | MiniDFSCluster cluster = new MiniDFSCluster(conf, DATANODE_NUM, true, null); |
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59 | try { |
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60 | cluster.waitActive(); |
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61 | DistributedFileSystem dfs = (DistributedFileSystem)cluster.getFileSystem(); |
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62 | |
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63 | // create a new file. |
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64 | TestFileCreation.createFile(dfs, new Path("/foo"), DATANODE_NUM); |
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65 | TestFileCreation.createFile(dfs, new Path("/foo2"), DATANODE_NUM); |
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66 | TestFileCreation.createFile(dfs, new Path("/foo3"), DATANODE_NUM); |
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67 | |
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68 | // set the soft and hard limit to be 1 second so that the |
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69 | // namenode triggers lease recovery |
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70 | cluster.setLeasePeriod(leasePeriod, leasePeriod); |
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71 | // wait for the lease to expire |
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72 | try {Thread.sleep(5 * leasePeriod);} catch (InterruptedException e) {} |
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73 | |
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74 | assertFalse(isConcurrentModificationException); |
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75 | } finally { |
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76 | Thread.setDefaultUncaughtExceptionHandler(oldUEH); |
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77 | cluster.shutdown(); |
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78 | } |
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79 | } |
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80 | } |
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