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.io.File; |
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21 | import junit.framework.TestCase; |
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22 | import org.apache.commons.logging.Log; |
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23 | import org.apache.commons.logging.LogFactory; |
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24 | import org.apache.hadoop.conf.Configuration; |
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25 | import org.apache.hadoop.hdfs.protocol.FSConstants; |
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26 | import org.apache.hadoop.hdfs.server.common.HdfsConstants.NodeType; |
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27 | import org.apache.hadoop.hdfs.server.common.HdfsConstants.StartupOption; |
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28 | |
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29 | import static org.apache.hadoop.hdfs.server.common.HdfsConstants.NodeType.NAME_NODE; |
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30 | import static org.apache.hadoop.hdfs.server.common.HdfsConstants.NodeType.DATA_NODE; |
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31 | |
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32 | import org.apache.hadoop.hdfs.server.common.HdfsConstants; |
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33 | import org.apache.hadoop.hdfs.server.common.Storage; |
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34 | import org.apache.hadoop.hdfs.server.common.StorageInfo; |
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35 | import org.apache.hadoop.fs.Path; |
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36 | |
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37 | /** |
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38 | * This test ensures the appropriate response (successful or failure) from |
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39 | * a Datanode when the system is started with differing version combinations. |
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40 | */ |
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41 | public class TestDFSStartupVersions extends TestCase { |
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42 | |
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43 | private static final Log LOG = LogFactory.getLog( |
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44 | "org.apache.hadoop.hdfs.TestDFSStartupVersions"); |
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45 | private static Path TEST_ROOT_DIR = new Path( |
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46 | System.getProperty("test.build.data","/tmp").toString().replace(' ', '+')); |
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47 | private MiniDFSCluster cluster = null; |
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48 | |
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49 | /** |
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50 | * Writes an INFO log message containing the parameters. |
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51 | */ |
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52 | void log(String label, NodeType nodeType, Integer testCase, StorageInfo version) { |
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53 | String testCaseLine = ""; |
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54 | if (testCase != null) { |
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55 | testCaseLine = " testCase="+testCase; |
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56 | } |
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57 | LOG.info("============================================================"); |
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58 | LOG.info("***TEST*** " + label + ":" |
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59 | + testCaseLine |
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60 | + " nodeType="+nodeType |
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61 | + " layoutVersion="+version.getLayoutVersion() |
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62 | + " namespaceID="+version.getNamespaceID() |
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63 | + " fsscTime="+version.getCTime()); |
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64 | } |
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65 | |
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66 | /** |
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67 | * Initialize the versions array. This array stores all combinations |
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68 | * of cross product: |
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69 | * {oldLayoutVersion,currentLayoutVersion,futureLayoutVersion} X |
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70 | * {currentNamespaceId,incorrectNamespaceId} X |
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71 | * {pastFsscTime,currentFsscTime,futureFsscTime} |
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72 | */ |
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73 | private StorageInfo[] initializeVersions() throws Exception { |
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74 | int layoutVersionOld = Storage.LAST_UPGRADABLE_LAYOUT_VERSION; |
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75 | int layoutVersionCur = UpgradeUtilities.getCurrentLayoutVersion(); |
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76 | int layoutVersionNew = Integer.MIN_VALUE; |
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77 | int namespaceIdCur = UpgradeUtilities.getCurrentNamespaceID(null); |
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78 | int namespaceIdOld = Integer.MIN_VALUE; |
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79 | long fsscTimeOld = Long.MIN_VALUE; |
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80 | long fsscTimeCur = UpgradeUtilities.getCurrentFsscTime(null); |
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81 | long fsscTimeNew = Long.MAX_VALUE; |
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82 | |
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83 | return new StorageInfo[] { |
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84 | new StorageInfo(layoutVersionOld, namespaceIdCur, fsscTimeOld), // 0 |
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85 | new StorageInfo(layoutVersionOld, namespaceIdCur, fsscTimeCur), // 1 |
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86 | new StorageInfo(layoutVersionOld, namespaceIdCur, fsscTimeNew), // 2 |
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87 | new StorageInfo(layoutVersionOld, namespaceIdOld, fsscTimeOld), // 3 |
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88 | new StorageInfo(layoutVersionOld, namespaceIdOld, fsscTimeCur), // 4 |
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89 | new StorageInfo(layoutVersionOld, namespaceIdOld, fsscTimeNew), // 5 |
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90 | new StorageInfo(layoutVersionCur, namespaceIdCur, fsscTimeOld), // 6 |
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91 | new StorageInfo(layoutVersionCur, namespaceIdCur, fsscTimeCur), // 7 |
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92 | new StorageInfo(layoutVersionCur, namespaceIdCur, fsscTimeNew), // 8 |
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93 | new StorageInfo(layoutVersionCur, namespaceIdOld, fsscTimeOld), // 9 |
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94 | new StorageInfo(layoutVersionCur, namespaceIdOld, fsscTimeCur), // 10 |
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95 | new StorageInfo(layoutVersionCur, namespaceIdOld, fsscTimeNew), // 11 |
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96 | new StorageInfo(layoutVersionNew, namespaceIdCur, fsscTimeOld), // 12 |
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97 | new StorageInfo(layoutVersionNew, namespaceIdCur, fsscTimeCur), // 13 |
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98 | new StorageInfo(layoutVersionNew, namespaceIdCur, fsscTimeNew), // 14 |
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99 | new StorageInfo(layoutVersionNew, namespaceIdOld, fsscTimeOld), // 15 |
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100 | new StorageInfo(layoutVersionNew, namespaceIdOld, fsscTimeCur), // 16 |
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101 | new StorageInfo(layoutVersionNew, namespaceIdOld, fsscTimeNew), // 17 |
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102 | }; |
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103 | } |
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104 | |
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105 | /** |
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106 | * Determines if the given Namenode version and Datanode version |
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107 | * are compatible with each other. Compatibility in this case mean |
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108 | * that the Namenode and Datanode will successfully start up and |
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109 | * will work together. The rules for compatibility, |
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110 | * taken from the DFS Upgrade Design, are as follows: |
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111 | * <pre> |
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112 | * 1. The data-node does regular startup (no matter which options |
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113 | * it is started with) if |
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114 | * softwareLV == storedLV AND |
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115 | * DataNode.FSSCTime == NameNode.FSSCTime |
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116 | * 2. The data-node performs an upgrade if it is started without any |
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117 | * options and |
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118 | * |softwareLV| > |storedLV| OR |
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119 | * (softwareLV == storedLV AND |
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120 | * DataNode.FSSCTime < NameNode.FSSCTime) |
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121 | * 3. NOT TESTED: The data-node rolls back if it is started with |
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122 | * the -rollback option and |
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123 | * |softwareLV| >= |previous.storedLV| AND |
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124 | * DataNode.previous.FSSCTime <= NameNode.FSSCTime |
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125 | * 4. In all other cases the startup fails. |
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126 | * </pre> |
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127 | */ |
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128 | boolean isVersionCompatible(StorageInfo namenodeVer, StorageInfo datanodeVer) { |
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129 | // check #0 |
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130 | if (namenodeVer.getNamespaceID() != datanodeVer.getNamespaceID()) { |
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131 | LOG.info("namespaceIDs are not equal: isVersionCompatible=false"); |
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132 | return false; |
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133 | } |
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134 | // check #1 |
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135 | int softwareLV = FSConstants.LAYOUT_VERSION; // will also be Namenode's LV |
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136 | int storedLV = datanodeVer.getLayoutVersion(); |
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137 | if (softwareLV == storedLV && |
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138 | datanodeVer.getCTime() == namenodeVer.getCTime()) |
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139 | { |
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140 | LOG.info("layoutVersions and cTimes are equal: isVersionCompatible=true"); |
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141 | return true; |
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142 | } |
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143 | // check #2 |
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144 | long absSoftwareLV = Math.abs((long)softwareLV); |
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145 | long absStoredLV = Math.abs((long)storedLV); |
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146 | if (absSoftwareLV > absStoredLV || |
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147 | (softwareLV == storedLV && |
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148 | datanodeVer.getCTime() < namenodeVer.getCTime())) |
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149 | { |
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150 | LOG.info("softwareLayoutVersion is newer OR namenode cTime is newer: isVersionCompatible=true"); |
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151 | return true; |
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152 | } |
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153 | // check #4 |
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154 | LOG.info("default case: isVersionCompatible=false"); |
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155 | return false; |
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156 | } |
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157 | |
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158 | /** |
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159 | * This test ensures the appropriate response (successful or failure) from |
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160 | * a Datanode when the system is started with differing version combinations. |
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161 | * <pre> |
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162 | * For each 3-tuple in the cross product |
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163 | * ({oldLayoutVersion,currentLayoutVersion,futureLayoutVersion}, |
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164 | * {currentNamespaceId,incorrectNamespaceId}, |
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165 | * {pastFsscTime,currentFsscTime,futureFsscTime}) |
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166 | * 1. Startup Namenode with version file containing |
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167 | * (currentLayoutVersion,currentNamespaceId,currentFsscTime) |
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168 | * 2. Attempt to startup Datanode with version file containing |
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169 | * this iterations version 3-tuple |
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170 | * </pre> |
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171 | */ |
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172 | public void testVersions() throws Exception { |
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173 | UpgradeUtilities.initialize(); |
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174 | Configuration conf = UpgradeUtilities.initializeStorageStateConf(1, |
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175 | new Configuration()); |
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176 | StorageInfo[] versions = initializeVersions(); |
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177 | UpgradeUtilities.createStorageDirs( |
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178 | NAME_NODE, conf.getStrings("dfs.name.dir"), "current"); |
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179 | cluster = new MiniDFSCluster(conf, 0, StartupOption.REGULAR); |
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180 | StorageInfo nameNodeVersion = new StorageInfo( |
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181 | UpgradeUtilities.getCurrentLayoutVersion(), |
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182 | UpgradeUtilities.getCurrentNamespaceID(cluster), |
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183 | UpgradeUtilities.getCurrentFsscTime(cluster)); |
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184 | log("NameNode version info", NAME_NODE, null, nameNodeVersion); |
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185 | for (int i = 0; i < versions.length; i++) { |
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186 | File[] storage = UpgradeUtilities.createStorageDirs( |
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187 | DATA_NODE, conf.getStrings("dfs.data.dir"), "current"); |
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188 | log("DataNode version info", DATA_NODE, i, versions[i]); |
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189 | UpgradeUtilities.createVersionFile(DATA_NODE, storage, versions[i]); |
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190 | try { |
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191 | cluster.startDataNodes(conf, 1, false, StartupOption.REGULAR, null); |
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192 | } catch (Exception ignore) { |
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193 | // Ignore. The asserts below will check for problems. |
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194 | // ignore.printStackTrace(); |
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195 | } |
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196 | assertTrue(cluster.getNameNode() != null); |
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197 | assertEquals(isVersionCompatible(nameNodeVersion, versions[i]), |
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198 | cluster.isDataNodeUp()); |
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199 | cluster.shutdownDataNodes(); |
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200 | } |
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201 | } |
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202 | |
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203 | protected void tearDown() throws Exception { |
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204 | LOG.info("Shutting down MiniDFSCluster"); |
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205 | if (cluster != null) cluster.shutdown(); |
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206 | } |
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207 | |
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208 | public static void main(String[] args) throws Exception { |
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209 | new TestDFSStartupVersions().testVersions(); |
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210 | } |
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211 | |
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212 | } |
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213 | |
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