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.IOException; |
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22 | |
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23 | import org.apache.commons.logging.Log; |
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24 | import org.apache.commons.logging.LogFactory; |
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25 | import org.apache.hadoop.conf.Configuration; |
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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.hdfs.protocol.FSConstants.SafeModeAction; |
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29 | import org.apache.hadoop.hdfs.server.namenode.NameNode; |
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30 | |
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31 | import junit.framework.TestCase; |
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32 | |
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33 | /** |
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34 | * This test makes sure that if SafeMode is manually entered, NameNode does not |
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35 | * come out of safe mode even after the startup safemode conditions are met. |
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36 | */ |
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37 | public class TestSafeMode extends TestCase { |
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38 | |
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39 | static Log LOG = LogFactory.getLog(TestSafeMode.class); |
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40 | |
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41 | public void testManualSafeMode() throws IOException { |
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42 | MiniDFSCluster cluster = null; |
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43 | FileSystem fs = null; |
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44 | try { |
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45 | Configuration conf = new Configuration(); |
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46 | // disable safemode extension to make the test run faster. |
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47 | conf.set("dfs.safemode.extension", "1"); |
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48 | cluster = new MiniDFSCluster(conf, 1, true, null); |
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49 | cluster.waitActive(); |
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50 | |
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51 | fs = cluster.getFileSystem(); |
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52 | Path file1 = new Path("/tmp/testManualSafeMode/file1"); |
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53 | Path file2 = new Path("/tmp/testManualSafeMode/file2"); |
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54 | |
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55 | LOG.info("Created file1 and file2."); |
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56 | |
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57 | // create two files with one block each. |
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58 | DFSTestUtil.createFile(fs, file1, 1000, (short)1, 0); |
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59 | DFSTestUtil.createFile(fs, file2, 2000, (short)1, 0); |
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60 | cluster.shutdown(); |
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61 | |
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62 | // now bring up just the NameNode. |
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63 | cluster = new MiniDFSCluster(conf, 0, false, null); |
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64 | cluster.waitActive(); |
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65 | |
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66 | LOG.info("Restarted cluster with just the NameNode"); |
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67 | |
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68 | NameNode namenode = cluster.getNameNode(); |
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69 | |
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70 | assertTrue("No datanode is started. Should be in SafeMode", |
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71 | namenode.isInSafeMode()); |
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72 | |
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73 | // manually set safemode. |
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74 | namenode.setSafeMode(SafeModeAction.SAFEMODE_ENTER); |
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75 | |
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76 | // now bring up the datanode and wait for it to be active. |
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77 | cluster.startDataNodes(conf, 1, true, null, null); |
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78 | cluster.waitActive(); |
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79 | |
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80 | LOG.info("Datanode is started."); |
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81 | |
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82 | try { |
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83 | Thread.sleep(2000); |
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84 | } catch (InterruptedException ignored) {} |
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85 | |
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86 | assertTrue("should still be in SafeMode", namenode.isInSafeMode()); |
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87 | |
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88 | namenode.setSafeMode(SafeModeAction.SAFEMODE_LEAVE); |
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89 | assertFalse("should not be in SafeMode", namenode.isInSafeMode()); |
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90 | } finally { |
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91 | if(fs != null) fs.close(); |
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92 | if(cluster!= null) cluster.shutdown(); |
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93 | } |
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94 | } |
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95 | } |
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