[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 | |
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| 19 | package org.apache.hadoop.hdfs.server.namenode; |
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| 20 | |
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| 21 | import java.io.IOException; |
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| 22 | import java.util.ArrayList; |
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| 23 | import java.util.List; |
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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.net.NetworkTopology; |
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| 27 | import org.apache.hadoop.net.Node; |
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| 28 | import org.apache.hadoop.fs.FileSystem; |
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| 29 | import org.apache.hadoop.hdfs.protocol.DatanodeID; |
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| 30 | import org.apache.hadoop.hdfs.protocol.FSConstants; |
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| 31 | |
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| 32 | import junit.framework.TestCase; |
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| 33 | |
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| 34 | public class TestReplicationPolicy extends TestCase { |
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| 35 | private static final int BLOCK_SIZE = 1024; |
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| 36 | private static final int NUM_OF_DATANODES = 6; |
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| 37 | private static final Configuration CONF = new Configuration(); |
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| 38 | private static final NetworkTopology cluster; |
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| 39 | private static final NameNode namenode; |
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| 40 | private static final ReplicationTargetChooser replicator; |
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| 41 | private static final DatanodeDescriptor dataNodes[] = |
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| 42 | new DatanodeDescriptor[] { |
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| 43 | new DatanodeDescriptor(new DatanodeID("h1:5020"), "/d1/r1"), |
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| 44 | new DatanodeDescriptor(new DatanodeID("h2:5020"), "/d1/r1"), |
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| 45 | new DatanodeDescriptor(new DatanodeID("h3:5020"), "/d1/r2"), |
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| 46 | new DatanodeDescriptor(new DatanodeID("h4:5020"), "/d1/r2"), |
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| 47 | new DatanodeDescriptor(new DatanodeID("h5:5020"), "/d2/r3"), |
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| 48 | new DatanodeDescriptor(new DatanodeID("h6:5020"), "/d2/r3") |
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| 49 | }; |
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| 50 | |
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| 51 | private final static DatanodeDescriptor NODE = |
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| 52 | new DatanodeDescriptor(new DatanodeID("h7:5020"), "/d2/r4"); |
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| 53 | |
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| 54 | static { |
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| 55 | try { |
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| 56 | FileSystem.setDefaultUri(CONF, "hdfs://localhost:0"); |
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| 57 | CONF.set("dfs.http.address", "0.0.0.0:0"); |
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| 58 | NameNode.format(CONF); |
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| 59 | namenode = new NameNode(CONF); |
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| 60 | } catch (IOException e) { |
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| 61 | e.printStackTrace(); |
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| 62 | throw (RuntimeException)new RuntimeException().initCause(e); |
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| 63 | } |
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| 64 | FSNamesystem fsNamesystem = FSNamesystem.getFSNamesystem(); |
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| 65 | replicator = fsNamesystem.replicator; |
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| 66 | cluster = fsNamesystem.clusterMap; |
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| 67 | // construct network topology |
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| 68 | for(int i=0; i<NUM_OF_DATANODES; i++) { |
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| 69 | cluster.add(dataNodes[i]); |
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| 70 | } |
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| 71 | for(int i=0; i<NUM_OF_DATANODES; i++) { |
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| 72 | dataNodes[i].updateHeartbeat( |
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| 73 | 2*FSConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, |
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| 74 | 2*FSConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0); |
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| 75 | } |
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| 76 | } |
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| 77 | |
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| 78 | /** |
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| 79 | * In this testcase, client is dataNodes[0]. So the 1st replica should be |
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| 80 | * placed on dataNodes[0], the 2nd replica should be placed on |
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| 81 | * different rack and third should be placed on different node |
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| 82 | * of rack chosen for 2nd node. |
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| 83 | * The only excpetion is when the <i>numOfReplicas</i> is 2, |
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| 84 | * the 1st is on dataNodes[0] and the 2nd is on a different rack. |
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| 85 | * @throws Exception |
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| 86 | */ |
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| 87 | public void testChooseTarget1() throws Exception { |
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| 88 | dataNodes[0].updateHeartbeat( |
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| 89 | 2*FSConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, |
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| 90 | FSConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 4); // overloaded |
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| 91 | |
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| 92 | DatanodeDescriptor[] targets; |
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| 93 | targets = replicator.chooseTarget( |
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| 94 | 0, dataNodes[0], null, BLOCK_SIZE); |
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| 95 | assertEquals(targets.length, 0); |
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| 96 | |
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| 97 | targets = replicator.chooseTarget( |
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| 98 | 1, dataNodes[0], null, BLOCK_SIZE); |
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| 99 | assertEquals(targets.length, 1); |
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| 100 | assertEquals(targets[0], dataNodes[0]); |
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| 101 | |
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| 102 | targets = replicator.chooseTarget( |
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| 103 | 2, dataNodes[0], null, BLOCK_SIZE); |
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| 104 | assertEquals(targets.length, 2); |
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| 105 | assertEquals(targets[0], dataNodes[0]); |
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| 106 | assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
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| 107 | |
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| 108 | targets = replicator.chooseTarget( |
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| 109 | 3, dataNodes[0], null, BLOCK_SIZE); |
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| 110 | assertEquals(targets.length, 3); |
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| 111 | assertEquals(targets[0], dataNodes[0]); |
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| 112 | assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
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| 113 | assertTrue(cluster.isOnSameRack(targets[1], targets[2])); |
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| 114 | |
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| 115 | targets = replicator.chooseTarget( |
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| 116 | 4, dataNodes[0], null, BLOCK_SIZE); |
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| 117 | assertEquals(targets.length, 4); |
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| 118 | assertEquals(targets[0], dataNodes[0]); |
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| 119 | assertTrue(cluster.isOnSameRack(targets[1], targets[2]) || |
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| 120 | cluster.isOnSameRack(targets[2], targets[3])); |
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| 121 | assertFalse(cluster.isOnSameRack(targets[0], targets[2])); |
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| 122 | |
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| 123 | dataNodes[0].updateHeartbeat( |
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| 124 | 2*FSConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, |
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| 125 | FSConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0); |
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| 126 | } |
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| 127 | |
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| 128 | /** |
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| 129 | * In this testcase, client is dataNodes[0], but the dataNodes[1] is |
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| 130 | * not allowed to be chosen. So the 1st replica should be |
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| 131 | * placed on dataNodes[0], the 2nd replica should be placed on a different |
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| 132 | * rack, the 3rd should be on same rack as the 2nd replica, and the rest |
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| 133 | * should be placed on a third rack. |
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| 134 | * @throws Exception |
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| 135 | */ |
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| 136 | public void testChooseTarget2() throws Exception { |
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| 137 | List<Node> excludedNodes; |
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| 138 | DatanodeDescriptor[] targets; |
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| 139 | |
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| 140 | excludedNodes = new ArrayList<Node>(); |
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| 141 | excludedNodes.add(dataNodes[1]); |
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| 142 | targets = replicator.chooseTarget( |
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| 143 | 0, dataNodes[0], excludedNodes, BLOCK_SIZE); |
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| 144 | assertEquals(targets.length, 0); |
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| 145 | |
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| 146 | excludedNodes.clear(); |
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| 147 | excludedNodes.add(dataNodes[1]); |
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| 148 | targets = replicator.chooseTarget( |
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| 149 | 1, dataNodes[0], excludedNodes, BLOCK_SIZE); |
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| 150 | assertEquals(targets.length, 1); |
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| 151 | assertEquals(targets[0], dataNodes[0]); |
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| 152 | |
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| 153 | excludedNodes.clear(); |
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| 154 | excludedNodes.add(dataNodes[1]); |
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| 155 | targets = replicator.chooseTarget( |
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| 156 | 2, dataNodes[0], excludedNodes, BLOCK_SIZE); |
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| 157 | assertEquals(targets.length, 2); |
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| 158 | assertEquals(targets[0], dataNodes[0]); |
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| 159 | assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
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| 160 | |
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| 161 | excludedNodes.clear(); |
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| 162 | excludedNodes.add(dataNodes[1]); |
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| 163 | targets = replicator.chooseTarget( |
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| 164 | 3, dataNodes[0], excludedNodes, BLOCK_SIZE); |
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| 165 | assertEquals(targets.length, 3); |
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| 166 | assertEquals(targets[0], dataNodes[0]); |
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| 167 | assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
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| 168 | assertTrue(cluster.isOnSameRack(targets[1], targets[2])); |
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| 169 | |
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| 170 | excludedNodes.clear(); |
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| 171 | excludedNodes.add(dataNodes[1]); |
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| 172 | targets = replicator.chooseTarget( |
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| 173 | 4, dataNodes[0], excludedNodes, BLOCK_SIZE); |
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| 174 | assertEquals(targets.length, 4); |
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| 175 | assertEquals(targets[0], dataNodes[0]); |
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| 176 | for(int i=1; i<4; i++) { |
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| 177 | assertFalse(cluster.isOnSameRack(targets[0], targets[i])); |
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| 178 | } |
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| 179 | assertTrue(cluster.isOnSameRack(targets[1], targets[2]) || |
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| 180 | cluster.isOnSameRack(targets[2], targets[3])); |
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| 181 | assertFalse(cluster.isOnSameRack(targets[1], targets[3])); |
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| 182 | } |
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| 183 | |
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| 184 | /** |
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| 185 | * In this testcase, client is dataNodes[0], but dataNodes[0] is not qualified |
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| 186 | * to be chosen. So the 1st replica should be placed on dataNodes[1], |
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| 187 | * the 2nd replica should be placed on a different rack, |
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| 188 | * the 3rd replica should be placed on the same rack as the 2nd replica, |
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| 189 | * and the rest should be placed on the third rack. |
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| 190 | * @throws Exception |
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| 191 | */ |
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| 192 | public void testChooseTarget3() throws Exception { |
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| 193 | // make data node 0 to be not qualified to choose |
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| 194 | dataNodes[0].updateHeartbeat( |
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| 195 | 2*FSConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, |
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| 196 | (FSConstants.MIN_BLOCKS_FOR_WRITE-1)*BLOCK_SIZE, 0); // no space |
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| 197 | |
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| 198 | DatanodeDescriptor[] targets; |
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| 199 | targets = replicator.chooseTarget( |
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| 200 | 0, dataNodes[0], null, BLOCK_SIZE); |
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| 201 | assertEquals(targets.length, 0); |
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| 202 | |
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| 203 | targets = replicator.chooseTarget( |
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| 204 | 1, dataNodes[0], null, BLOCK_SIZE); |
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| 205 | assertEquals(targets.length, 1); |
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| 206 | assertEquals(targets[0], dataNodes[1]); |
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| 207 | |
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| 208 | targets = replicator.chooseTarget( |
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| 209 | 2, dataNodes[0], null, BLOCK_SIZE); |
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| 210 | assertEquals(targets.length, 2); |
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| 211 | assertEquals(targets[0], dataNodes[1]); |
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| 212 | assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
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| 213 | |
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| 214 | targets = replicator.chooseTarget( |
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| 215 | 3, dataNodes[0], null, BLOCK_SIZE); |
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| 216 | assertEquals(targets.length, 3); |
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| 217 | assertEquals(targets[0], dataNodes[1]); |
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| 218 | assertTrue(cluster.isOnSameRack(targets[1], targets[2])); |
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| 219 | assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
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| 220 | |
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| 221 | targets = replicator.chooseTarget( |
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| 222 | 4, dataNodes[0], null, BLOCK_SIZE); |
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| 223 | assertEquals(targets.length, 4); |
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| 224 | assertEquals(targets[0], dataNodes[1]); |
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| 225 | for(int i=1; i<4; i++) { |
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| 226 | assertFalse(cluster.isOnSameRack(targets[0], targets[i])); |
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| 227 | } |
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| 228 | assertTrue(cluster.isOnSameRack(targets[1], targets[2]) || |
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| 229 | cluster.isOnSameRack(targets[2], targets[3])); |
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| 230 | assertFalse(cluster.isOnSameRack(targets[1], targets[3])); |
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| 231 | |
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| 232 | dataNodes[0].updateHeartbeat( |
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| 233 | 2*FSConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, |
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| 234 | FSConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0); |
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| 235 | } |
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| 236 | |
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| 237 | /** |
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| 238 | * In this testcase, client is dataNodes[0], but none of the nodes on rack 1 |
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| 239 | * is qualified to be chosen. So the 1st replica should be placed on either |
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| 240 | * rack 2 or rack 3. |
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| 241 | * the 2nd replica should be placed on a different rack, |
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| 242 | * the 3rd replica should be placed on the same rack as the 1st replica, |
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| 243 | * @throws Exception |
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| 244 | */ |
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| 245 | public void testChoooseTarget4() throws Exception { |
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| 246 | // make data node 0 & 1 to be not qualified to choose: not enough disk space |
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| 247 | for(int i=0; i<2; i++) { |
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| 248 | dataNodes[i].updateHeartbeat( |
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| 249 | 2*FSConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, |
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| 250 | (FSConstants.MIN_BLOCKS_FOR_WRITE-1)*BLOCK_SIZE, 0); |
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| 251 | } |
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| 252 | |
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| 253 | DatanodeDescriptor[] targets; |
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| 254 | targets = replicator.chooseTarget( |
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| 255 | 0, dataNodes[0], null, BLOCK_SIZE); |
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| 256 | assertEquals(targets.length, 0); |
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| 257 | |
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| 258 | targets = replicator.chooseTarget( |
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| 259 | 1, dataNodes[0], null, BLOCK_SIZE); |
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| 260 | assertEquals(targets.length, 1); |
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| 261 | assertFalse(cluster.isOnSameRack(targets[0], dataNodes[0])); |
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| 262 | |
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| 263 | targets = replicator.chooseTarget( |
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| 264 | 2, dataNodes[0], null, BLOCK_SIZE); |
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| 265 | assertEquals(targets.length, 2); |
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| 266 | assertFalse(cluster.isOnSameRack(targets[0], dataNodes[0])); |
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| 267 | assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
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| 268 | |
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| 269 | targets = replicator.chooseTarget( |
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| 270 | 3, dataNodes[0], null, BLOCK_SIZE); |
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| 271 | assertEquals(targets.length, 3); |
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| 272 | for(int i=0; i<3; i++) { |
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| 273 | assertFalse(cluster.isOnSameRack(targets[i], dataNodes[0])); |
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| 274 | } |
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| 275 | assertTrue(cluster.isOnSameRack(targets[0], targets[1]) || |
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| 276 | cluster.isOnSameRack(targets[1], targets[2])); |
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| 277 | assertFalse(cluster.isOnSameRack(targets[0], targets[2])); |
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| 278 | |
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| 279 | for(int i=0; i<2; i++) { |
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| 280 | dataNodes[i].updateHeartbeat( |
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| 281 | 2*FSConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, |
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| 282 | FSConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0); |
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| 283 | } |
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| 284 | } |
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| 285 | /** |
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| 286 | * In this testcase, client is is a node outside of file system. |
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| 287 | * So the 1st replica can be placed on any node. |
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| 288 | * the 2nd replica should be placed on a different rack, |
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| 289 | * the 3rd replica should be placed on the same rack as the 2nd replica, |
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| 290 | * @throws Exception |
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| 291 | */ |
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| 292 | public void testChooseTarget5() throws Exception { |
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| 293 | DatanodeDescriptor[] targets; |
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| 294 | targets = replicator.chooseTarget( |
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| 295 | 0, NODE, null, BLOCK_SIZE); |
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| 296 | assertEquals(targets.length, 0); |
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| 297 | |
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| 298 | targets = replicator.chooseTarget( |
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| 299 | 1, NODE, null, BLOCK_SIZE); |
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| 300 | assertEquals(targets.length, 1); |
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| 301 | |
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| 302 | targets = replicator.chooseTarget( |
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| 303 | 2, NODE, null, BLOCK_SIZE); |
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| 304 | assertEquals(targets.length, 2); |
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| 305 | assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
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| 306 | |
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| 307 | targets = replicator.chooseTarget( |
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| 308 | 3, NODE, null, BLOCK_SIZE); |
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| 309 | assertEquals(targets.length, 3); |
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| 310 | assertTrue(cluster.isOnSameRack(targets[1], targets[2])); |
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| 311 | assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
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| 312 | } |
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| 313 | |
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| 314 | /** |
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| 315 | * This testcase tests re-replication, when dataNodes[0] is already chosen. |
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| 316 | * So the 1st replica can be placed on random rack. |
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| 317 | * the 2nd replica should be placed on different node by same rack as |
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| 318 | * the 1st replica. The 3rd replica can be placed randomly. |
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| 319 | * @throws Exception |
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| 320 | */ |
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| 321 | public void testRereplicate1() throws Exception { |
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| 322 | List<DatanodeDescriptor> chosenNodes = new ArrayList<DatanodeDescriptor>(); |
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| 323 | chosenNodes.add(dataNodes[0]); |
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| 324 | DatanodeDescriptor[] targets; |
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| 325 | |
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| 326 | targets = replicator.chooseTarget( |
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| 327 | 0, dataNodes[0], chosenNodes, null, BLOCK_SIZE); |
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| 328 | assertEquals(targets.length, 0); |
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| 329 | |
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| 330 | targets = replicator.chooseTarget( |
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| 331 | 1, dataNodes[0], chosenNodes, null, BLOCK_SIZE); |
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| 332 | assertEquals(targets.length, 1); |
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| 333 | assertFalse(cluster.isOnSameRack(dataNodes[0], targets[0])); |
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| 334 | |
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| 335 | targets = replicator.chooseTarget( |
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| 336 | 2, dataNodes[0], chosenNodes, null, BLOCK_SIZE); |
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| 337 | assertEquals(targets.length, 2); |
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| 338 | assertTrue(cluster.isOnSameRack(dataNodes[0], targets[0])); |
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| 339 | assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
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| 340 | |
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| 341 | targets = replicator.chooseTarget( |
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| 342 | 3, dataNodes[0], chosenNodes, null, BLOCK_SIZE); |
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| 343 | assertEquals(targets.length, 3); |
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| 344 | assertTrue(cluster.isOnSameRack(dataNodes[0], targets[0])); |
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| 345 | assertFalse(cluster.isOnSameRack(targets[0], targets[2])); |
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| 346 | } |
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| 347 | |
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| 348 | /** |
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| 349 | * This testcase tests re-replication, |
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| 350 | * when dataNodes[0] and dataNodes[1] are already chosen. |
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| 351 | * So the 1st replica should be placed on a different rack than rack 1. |
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| 352 | * the rest replicas can be placed randomly, |
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| 353 | * @throws Exception |
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| 354 | */ |
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| 355 | public void testRereplicate2() throws Exception { |
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| 356 | List<DatanodeDescriptor> chosenNodes = new ArrayList<DatanodeDescriptor>(); |
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| 357 | chosenNodes.add(dataNodes[0]); |
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| 358 | chosenNodes.add(dataNodes[1]); |
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| 359 | |
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| 360 | DatanodeDescriptor[] targets; |
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| 361 | targets = replicator.chooseTarget( |
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| 362 | 0, dataNodes[0], chosenNodes, null, BLOCK_SIZE); |
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| 363 | assertEquals(targets.length, 0); |
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| 364 | |
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| 365 | targets = replicator.chooseTarget( |
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| 366 | 1, dataNodes[0], chosenNodes, null, BLOCK_SIZE); |
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| 367 | assertEquals(targets.length, 1); |
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| 368 | assertFalse(cluster.isOnSameRack(dataNodes[0], targets[0])); |
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| 369 | |
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| 370 | targets = replicator.chooseTarget( |
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| 371 | 2, dataNodes[0], chosenNodes, null, BLOCK_SIZE); |
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| 372 | assertEquals(targets.length, 2); |
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| 373 | assertFalse(cluster.isOnSameRack(dataNodes[0], targets[0])); |
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| 374 | assertFalse(cluster.isOnSameRack(dataNodes[0], targets[1])); |
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| 375 | } |
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| 376 | |
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| 377 | /** |
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| 378 | * This testcase tests re-replication, |
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| 379 | * when dataNodes[0] and dataNodes[2] are already chosen. |
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| 380 | * So the 1st replica should be placed on the rack that the writer resides. |
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| 381 | * the rest replicas can be placed randomly, |
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| 382 | * @throws Exception |
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| 383 | */ |
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| 384 | public void testRereplicate3() throws Exception { |
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| 385 | List<DatanodeDescriptor> chosenNodes = new ArrayList<DatanodeDescriptor>(); |
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| 386 | chosenNodes.add(dataNodes[0]); |
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| 387 | chosenNodes.add(dataNodes[2]); |
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| 388 | |
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| 389 | DatanodeDescriptor[] targets; |
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| 390 | targets = replicator.chooseTarget( |
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| 391 | 0, dataNodes[0], chosenNodes, null, BLOCK_SIZE); |
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| 392 | assertEquals(targets.length, 0); |
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| 393 | |
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| 394 | targets = replicator.chooseTarget( |
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| 395 | 1, dataNodes[0], chosenNodes, null, BLOCK_SIZE); |
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| 396 | assertEquals(targets.length, 1); |
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| 397 | assertTrue(cluster.isOnSameRack(dataNodes[0], targets[0])); |
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| 398 | assertFalse(cluster.isOnSameRack(dataNodes[2], targets[0])); |
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| 399 | |
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| 400 | targets = replicator.chooseTarget( |
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| 401 | 1, dataNodes[2], chosenNodes, null, BLOCK_SIZE); |
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| 402 | assertEquals(targets.length, 1); |
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| 403 | assertTrue(cluster.isOnSameRack(dataNodes[2], targets[0])); |
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| 404 | assertFalse(cluster.isOnSameRack(dataNodes[0], targets[0])); |
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| 405 | |
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| 406 | targets = replicator.chooseTarget( |
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| 407 | 2, dataNodes[0], chosenNodes, null, BLOCK_SIZE); |
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| 408 | assertEquals(targets.length, 2); |
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| 409 | assertTrue(cluster.isOnSameRack(dataNodes[0], targets[0])); |
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| 410 | |
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| 411 | targets = replicator.chooseTarget( |
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| 412 | 2, dataNodes[2], chosenNodes, null, BLOCK_SIZE); |
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| 413 | assertEquals(targets.length, 2); |
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| 414 | assertTrue(cluster.isOnSameRack(dataNodes[2], targets[0])); |
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| 415 | } |
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| 416 | |
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| 417 | } |
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