| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.hdfs.server.blockmanagement; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertTrue; |
| |
| import java.io.File; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.CommonConfigurationKeysPublic; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.hdfs.DFSConfigKeys; |
| import org.apache.hadoop.hdfs.DFSTestUtil; |
| import org.apache.hadoop.hdfs.HdfsConfiguration; |
| import org.apache.hadoop.hdfs.protocol.HdfsConstants; |
| import org.apache.hadoop.hdfs.server.namenode.NameNode; |
| import org.apache.hadoop.net.NetworkTopology; |
| import org.apache.hadoop.net.NetworkTopologyWithNodeGroup; |
| import org.apache.hadoop.net.Node; |
| import org.apache.hadoop.test.PathUtils; |
| import org.junit.After; |
| import org.junit.Before; |
| import org.junit.Test; |
| |
| public class TestReplicationPolicyWithNodeGroup { |
| private static final int BLOCK_SIZE = 1024; |
| private static final int NUM_OF_DATANODES = 8; |
| private static final int NUM_OF_DATANODES_BOUNDARY = 6; |
| private static final int NUM_OF_DATANODES_MORE_TARGETS = 12; |
| private final Configuration CONF = new HdfsConfiguration(); |
| private NetworkTopology cluster; |
| private NameNode namenode; |
| private BlockPlacementPolicy replicator; |
| private static final String filename = "/dummyfile.txt"; |
| |
| private final static DatanodeDescriptor dataNodes[] = new DatanodeDescriptor[] { |
| DFSTestUtil.getDatanodeDescriptor("1.1.1.1", "/d1/r1/n1"), |
| DFSTestUtil.getDatanodeDescriptor("2.2.2.2", "/d1/r1/n1"), |
| DFSTestUtil.getDatanodeDescriptor("3.3.3.3", "/d1/r1/n2"), |
| DFSTestUtil.getDatanodeDescriptor("4.4.4.4", "/d1/r2/n3"), |
| DFSTestUtil.getDatanodeDescriptor("5.5.5.5", "/d1/r2/n3"), |
| DFSTestUtil.getDatanodeDescriptor("6.6.6.6", "/d1/r2/n4"), |
| DFSTestUtil.getDatanodeDescriptor("7.7.7.7", "/d2/r3/n5"), |
| DFSTestUtil.getDatanodeDescriptor("8.8.8.8", "/d2/r3/n6") |
| }; |
| |
| private final static DatanodeDescriptor dataNodesInBoundaryCase[] = |
| new DatanodeDescriptor[] { |
| DFSTestUtil.getDatanodeDescriptor("1.1.1.1", "/d1/r1/n1"), |
| DFSTestUtil.getDatanodeDescriptor("2.2.2.2", "/d1/r1/n1"), |
| DFSTestUtil.getDatanodeDescriptor("3.3.3.3", "/d1/r1/n1"), |
| DFSTestUtil.getDatanodeDescriptor("4.4.4.4", "/d1/r1/n2"), |
| DFSTestUtil.getDatanodeDescriptor("5.5.5.5", "/d1/r2/n3"), |
| DFSTestUtil.getDatanodeDescriptor("6.6.6.6", "/d1/r2/n3") |
| }; |
| |
| private final static DatanodeDescriptor dataNodesInMoreTargetsCase[] = |
| new DatanodeDescriptor[] { |
| DFSTestUtil.getDatanodeDescriptor("1.1.1.1", "/r1/n1"), |
| DFSTestUtil.getDatanodeDescriptor("2.2.2.2", "/r1/n1"), |
| DFSTestUtil.getDatanodeDescriptor("3.3.3.3", "/r1/n2"), |
| DFSTestUtil.getDatanodeDescriptor("4.4.4.4", "/r1/n2"), |
| DFSTestUtil.getDatanodeDescriptor("5.5.5.5", "/r1/n3"), |
| DFSTestUtil.getDatanodeDescriptor("6.6.6.6", "/r1/n3"), |
| DFSTestUtil.getDatanodeDescriptor("7.7.7.7", "/r2/n4"), |
| DFSTestUtil.getDatanodeDescriptor("8.8.8.8", "/r2/n4"), |
| DFSTestUtil.getDatanodeDescriptor("9.9.9.9", "/r2/n5"), |
| DFSTestUtil.getDatanodeDescriptor("10.10.10.10", "/r2/n5"), |
| DFSTestUtil.getDatanodeDescriptor("11.11.11.11", "/r2/n6"), |
| DFSTestUtil.getDatanodeDescriptor("12.12.12.12", "/r2/n6"), |
| }; |
| |
| private final static DatanodeDescriptor NODE = |
| new DatanodeDescriptor(DFSTestUtil.getDatanodeDescriptor("9.9.9.9", "/d2/r4/n7")); |
| |
| @Before |
| public void setUp() throws Exception { |
| FileSystem.setDefaultUri(CONF, "hdfs://localhost:0"); |
| CONF.set(DFSConfigKeys.DFS_NAMENODE_HTTP_ADDRESS_KEY, "0.0.0.0:0"); |
| // Set properties to make HDFS aware of NodeGroup. |
| CONF.set(DFSConfigKeys.DFS_BLOCK_REPLICATOR_CLASSNAME_KEY, |
| BlockPlacementPolicyWithNodeGroup.class.getName()); |
| CONF.set(CommonConfigurationKeysPublic.NET_TOPOLOGY_IMPL_KEY, |
| NetworkTopologyWithNodeGroup.class.getName()); |
| |
| File baseDir = PathUtils.getTestDir(TestReplicationPolicyWithNodeGroup.class); |
| |
| CONF.set(DFSConfigKeys.DFS_NAMENODE_NAME_DIR_KEY, |
| new File(baseDir, "name").getPath()); |
| |
| DFSTestUtil.formatNameNode(CONF); |
| namenode = new NameNode(CONF); |
| final BlockManager bm = namenode.getNamesystem().getBlockManager(); |
| replicator = bm.getBlockPlacementPolicy(); |
| cluster = bm.getDatanodeManager().getNetworkTopology(); |
| // construct network topology |
| for(int i=0; i<NUM_OF_DATANODES; i++) { |
| cluster.add(dataNodes[i]); |
| } |
| setupDataNodeCapacity(); |
| } |
| |
| @After |
| public void tearDown() throws Exception { |
| namenode.stop(); |
| } |
| |
| private static void setupDataNodeCapacity() { |
| for(int i=0; i<NUM_OF_DATANODES; i++) { |
| dataNodes[i].updateHeartbeat( |
| 2*HdfsConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, |
| 2*HdfsConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, 0, 0); |
| } |
| } |
| |
| /** |
| * Scan the targets list: all targets should be on different NodeGroups. |
| * Return false if two targets are found on the same NodeGroup. |
| */ |
| private static boolean checkTargetsOnDifferentNodeGroup( |
| DatanodeDescriptor[] targets) { |
| if(targets.length == 0) |
| return true; |
| Set<String> targetSet = new HashSet<String>(); |
| for(DatanodeDescriptor node:targets) { |
| String nodeGroup = NetworkTopology.getLastHalf(node.getNetworkLocation()); |
| if(targetSet.contains(nodeGroup)) { |
| return false; |
| } else { |
| targetSet.add(nodeGroup); |
| } |
| } |
| return true; |
| } |
| |
| private DatanodeDescriptor[] chooseTarget(int numOfReplicas) { |
| return chooseTarget(numOfReplicas, dataNodes[0]); |
| } |
| |
| private DatanodeDescriptor[] chooseTarget(int numOfReplicas, |
| DatanodeDescriptor writer) { |
| return chooseTarget(numOfReplicas, writer, |
| new ArrayList<DatanodeDescriptor>()); |
| } |
| |
| private DatanodeDescriptor[] chooseTarget(int numOfReplicas, |
| List<DatanodeDescriptor> chosenNodes) { |
| return chooseTarget(numOfReplicas, dataNodes[0], chosenNodes); |
| } |
| |
| private DatanodeDescriptor[] chooseTarget(int numOfReplicas, |
| DatanodeDescriptor writer, List<DatanodeDescriptor> chosenNodes) { |
| return chooseTarget(numOfReplicas, writer, chosenNodes, null); |
| } |
| |
| private DatanodeDescriptor[] chooseTarget( |
| int numOfReplicas, |
| DatanodeDescriptor writer, |
| List<DatanodeDescriptor> chosenNodes, |
| Set<Node> excludedNodes) { |
| return replicator.chooseTarget(filename, numOfReplicas, writer, chosenNodes, |
| false, excludedNodes, BLOCK_SIZE); |
| } |
| |
| /** |
| * In this testcase, client is dataNodes[0]. So the 1st replica should be |
| * placed on dataNodes[0], the 2nd replica should be placed on |
| * different rack and third should be placed on different node (and node group) |
| * of rack chosen for 2nd node. |
| * The only excpetion is when the <i>numOfReplicas</i> is 2, |
| * the 1st is on dataNodes[0] and the 2nd is on a different rack. |
| * @throws Exception |
| */ |
| @Test |
| public void testChooseTarget1() throws Exception { |
| dataNodes[0].updateHeartbeat( |
| 2*HdfsConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, |
| HdfsConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, 4, 0); // overloaded |
| |
| DatanodeDescriptor[] targets; |
| targets = chooseTarget(0); |
| assertEquals(targets.length, 0); |
| |
| targets = chooseTarget(1); |
| assertEquals(targets.length, 1); |
| assertEquals(targets[0], dataNodes[0]); |
| |
| targets = chooseTarget(2); |
| assertEquals(targets.length, 2); |
| assertEquals(targets[0], dataNodes[0]); |
| assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
| |
| targets = chooseTarget(3); |
| assertEquals(targets.length, 3); |
| assertEquals(targets[0], dataNodes[0]); |
| assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
| assertTrue(cluster.isOnSameRack(targets[1], targets[2])); |
| assertFalse(cluster.isOnSameNodeGroup(targets[1], targets[2])); |
| |
| targets = chooseTarget(4); |
| assertEquals(targets.length, 4); |
| assertEquals(targets[0], dataNodes[0]); |
| assertTrue(cluster.isOnSameRack(targets[1], targets[2]) || |
| cluster.isOnSameRack(targets[2], targets[3])); |
| assertFalse(cluster.isOnSameRack(targets[0], targets[2])); |
| // Make sure no more than one replicas are on the same nodegroup |
| verifyNoTwoTargetsOnSameNodeGroup(targets); |
| |
| dataNodes[0].updateHeartbeat( |
| 2*HdfsConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, |
| HdfsConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, 0, 0); |
| } |
| |
| private void verifyNoTwoTargetsOnSameNodeGroup(DatanodeDescriptor[] targets) { |
| Set<String> nodeGroupSet = new HashSet<String>(); |
| for (DatanodeDescriptor target: targets) { |
| nodeGroupSet.add(target.getNetworkLocation()); |
| } |
| assertEquals(nodeGroupSet.size(), targets.length); |
| } |
| |
| /** |
| * In this testcase, client is dataNodes[0], but the dataNodes[1] is |
| * not allowed to be chosen. So the 1st replica should be |
| * placed on dataNodes[0], the 2nd replica should be placed on a different |
| * rack, the 3rd should be on same rack as the 2nd replica but in different |
| * node group, and the rest should be placed on a third rack. |
| * @throws Exception |
| */ |
| @Test |
| public void testChooseTarget2() throws Exception { |
| DatanodeDescriptor[] targets; |
| BlockPlacementPolicyDefault repl = (BlockPlacementPolicyDefault)replicator; |
| List<DatanodeDescriptor> chosenNodes = new ArrayList<DatanodeDescriptor>(); |
| |
| Set<Node> excludedNodes = new HashSet<Node>(); |
| excludedNodes.add(dataNodes[1]); |
| targets = repl.chooseTarget(filename, 4, dataNodes[0], chosenNodes, false, |
| excludedNodes, BLOCK_SIZE); |
| assertEquals(targets.length, 4); |
| assertEquals(targets[0], dataNodes[0]); |
| assertTrue(cluster.isNodeGroupAware()); |
| // Make sure no replicas are on the same nodegroup |
| for (int i=1;i<4;i++) { |
| assertFalse(cluster.isOnSameNodeGroup(targets[0], targets[i])); |
| } |
| assertTrue(cluster.isOnSameRack(targets[1], targets[2]) || |
| cluster.isOnSameRack(targets[2], targets[3])); |
| assertFalse(cluster.isOnSameRack(targets[1], targets[3])); |
| |
| excludedNodes.clear(); |
| chosenNodes.clear(); |
| excludedNodes.add(dataNodes[1]); |
| chosenNodes.add(dataNodes[2]); |
| targets = repl.chooseTarget(filename, 1, dataNodes[0], chosenNodes, true, |
| excludedNodes, BLOCK_SIZE); |
| System.out.println("targets=" + Arrays.asList(targets)); |
| assertEquals(2, targets.length); |
| //make sure that the chosen node is in the target. |
| int i = 0; |
| for(; i < targets.length && !dataNodes[2].equals(targets[i]); i++); |
| assertTrue(i < targets.length); |
| } |
| |
| /** |
| * In this testcase, client is dataNodes[0], but dataNodes[0] is not qualified |
| * to be chosen. So the 1st replica should be placed on dataNodes[1], |
| * the 2nd replica should be placed on a different rack, |
| * the 3rd replica should be placed on the same rack as the 2nd replica but in different nodegroup, |
| * and the rest should be placed on the third rack. |
| * @throws Exception |
| */ |
| @Test |
| public void testChooseTarget3() throws Exception { |
| // make data node 0 to be not qualified to choose |
| dataNodes[0].updateHeartbeat( |
| 2*HdfsConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, |
| (HdfsConstants.MIN_BLOCKS_FOR_WRITE-1)*BLOCK_SIZE, 0L, 0, 0); // no space |
| |
| DatanodeDescriptor[] targets; |
| targets = chooseTarget(0); |
| assertEquals(targets.length, 0); |
| |
| targets = chooseTarget(1); |
| assertEquals(targets.length, 1); |
| assertEquals(targets[0], dataNodes[1]); |
| |
| targets = chooseTarget(2); |
| assertEquals(targets.length, 2); |
| assertEquals(targets[0], dataNodes[1]); |
| assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
| |
| targets = chooseTarget(3); |
| assertEquals(targets.length, 3); |
| assertEquals(targets[0], dataNodes[1]); |
| assertTrue(cluster.isOnSameRack(targets[1], targets[2])); |
| assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
| |
| targets = chooseTarget(4); |
| assertEquals(targets.length, 4); |
| assertEquals(targets[0], dataNodes[1]); |
| assertTrue(cluster.isNodeGroupAware()); |
| verifyNoTwoTargetsOnSameNodeGroup(targets); |
| assertTrue(cluster.isOnSameRack(targets[1], targets[2]) || |
| cluster.isOnSameRack(targets[2], targets[3])); |
| |
| dataNodes[0].updateHeartbeat( |
| 2*HdfsConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, |
| HdfsConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, 0, 0); |
| } |
| |
| /** |
| * In this testcase, client is dataNodes[0], but none of the nodes on rack 1 |
| * is qualified to be chosen. So the 1st replica should be placed on either |
| * rack 2 or rack 3. |
| * the 2nd replica should be placed on a different rack, |
| * the 3rd replica should be placed on the same rack as the 1st replica, but |
| * in different node group. |
| * @throws Exception |
| */ |
| @Test |
| public void testChooseTarget4() throws Exception { |
| // make data node 0-2 to be not qualified to choose: not enough disk space |
| for(int i=0; i<3; i++) { |
| dataNodes[i].updateHeartbeat( |
| 2*HdfsConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, |
| (HdfsConstants.MIN_BLOCKS_FOR_WRITE-1)*BLOCK_SIZE, 0L, 0, 0); |
| } |
| |
| DatanodeDescriptor[] targets; |
| targets = chooseTarget(0); |
| assertEquals(targets.length, 0); |
| |
| targets = chooseTarget(1); |
| assertEquals(targets.length, 1); |
| assertFalse(cluster.isOnSameRack(targets[0], dataNodes[0])); |
| |
| targets = chooseTarget(2); |
| assertEquals(targets.length, 2); |
| assertFalse(cluster.isOnSameRack(targets[0], dataNodes[0])); |
| assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
| |
| targets = chooseTarget(3); |
| assertEquals(targets.length, 3); |
| for(int i=0; i<3; i++) { |
| assertFalse(cluster.isOnSameRack(targets[i], dataNodes[0])); |
| } |
| verifyNoTwoTargetsOnSameNodeGroup(targets); |
| assertTrue(cluster.isOnSameRack(targets[0], targets[1]) || |
| cluster.isOnSameRack(targets[1], targets[2])); |
| assertFalse(cluster.isOnSameRack(targets[0], targets[2])); |
| } |
| |
| /** |
| * In this testcase, client is is a node outside of file system. |
| * So the 1st replica can be placed on any node. |
| * the 2nd replica should be placed on a different rack, |
| * the 3rd replica should be placed on the same rack as the 2nd replica, |
| * @throws Exception |
| */ |
| @Test |
| public void testChooseTarget5() throws Exception { |
| setupDataNodeCapacity(); |
| DatanodeDescriptor[] targets; |
| targets = chooseTarget(0, NODE); |
| assertEquals(targets.length, 0); |
| |
| targets = chooseTarget(1, NODE); |
| assertEquals(targets.length, 1); |
| |
| targets = chooseTarget(2, NODE); |
| assertEquals(targets.length, 2); |
| assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
| |
| targets = chooseTarget(3, NODE); |
| assertEquals(targets.length, 3); |
| assertTrue(cluster.isOnSameRack(targets[1], targets[2])); |
| assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
| verifyNoTwoTargetsOnSameNodeGroup(targets); |
| } |
| |
| /** |
| * This testcase tests re-replication, when dataNodes[0] is already chosen. |
| * So the 1st replica can be placed on random rack. |
| * the 2nd replica should be placed on different node and nodegroup by same rack as |
| * the 1st replica. The 3rd replica can be placed randomly. |
| * @throws Exception |
| */ |
| @Test |
| public void testRereplicate1() throws Exception { |
| setupDataNodeCapacity(); |
| List<DatanodeDescriptor> chosenNodes = new ArrayList<DatanodeDescriptor>(); |
| chosenNodes.add(dataNodes[0]); |
| DatanodeDescriptor[] targets; |
| |
| targets = chooseTarget(0, chosenNodes); |
| assertEquals(targets.length, 0); |
| |
| targets = chooseTarget(1, chosenNodes); |
| assertEquals(targets.length, 1); |
| assertFalse(cluster.isOnSameRack(dataNodes[0], targets[0])); |
| |
| targets = chooseTarget(2, chosenNodes); |
| assertEquals(targets.length, 2); |
| assertTrue(cluster.isOnSameRack(dataNodes[0], targets[0])); |
| assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
| |
| targets = chooseTarget(3, chosenNodes); |
| assertEquals(targets.length, 3); |
| assertTrue(cluster.isOnSameRack(dataNodes[0], targets[0])); |
| assertFalse(cluster.isOnSameNodeGroup(dataNodes[0], targets[0])); |
| assertFalse(cluster.isOnSameRack(targets[0], targets[2])); |
| } |
| |
| /** |
| * This testcase tests re-replication, |
| * when dataNodes[0] and dataNodes[1] are already chosen. |
| * So the 1st replica should be placed on a different rack of rack 1. |
| * the rest replicas can be placed randomly, |
| * @throws Exception |
| */ |
| @Test |
| public void testRereplicate2() throws Exception { |
| setupDataNodeCapacity(); |
| List<DatanodeDescriptor> chosenNodes = new ArrayList<DatanodeDescriptor>(); |
| chosenNodes.add(dataNodes[0]); |
| chosenNodes.add(dataNodes[1]); |
| |
| DatanodeDescriptor[] targets; |
| targets = chooseTarget(0, chosenNodes); |
| assertEquals(targets.length, 0); |
| |
| targets = chooseTarget(1, chosenNodes); |
| assertEquals(targets.length, 1); |
| assertFalse(cluster.isOnSameRack(dataNodes[0], targets[0])); |
| |
| targets = chooseTarget(2, chosenNodes); |
| assertEquals(targets.length, 2); |
| assertFalse(cluster.isOnSameRack(dataNodes[0], targets[0]) && |
| cluster.isOnSameRack(dataNodes[0], targets[1])); |
| } |
| |
| /** |
| * This testcase tests re-replication, |
| * when dataNodes[0] and dataNodes[3] are already chosen. |
| * So the 1st replica should be placed on the rack that the writer resides. |
| * the rest replicas can be placed randomly, |
| * @throws Exception |
| */ |
| @Test |
| public void testRereplicate3() throws Exception { |
| setupDataNodeCapacity(); |
| List<DatanodeDescriptor> chosenNodes = new ArrayList<DatanodeDescriptor>(); |
| chosenNodes.add(dataNodes[0]); |
| chosenNodes.add(dataNodes[3]); |
| |
| DatanodeDescriptor[] targets; |
| targets = chooseTarget(0, chosenNodes); |
| assertEquals(targets.length, 0); |
| |
| targets = chooseTarget(1, chosenNodes); |
| assertEquals(targets.length, 1); |
| assertTrue(cluster.isOnSameRack(dataNodes[0], targets[0])); |
| assertFalse(cluster.isOnSameRack(dataNodes[3], targets[0])); |
| |
| targets = chooseTarget(1, dataNodes[3], chosenNodes); |
| assertEquals(targets.length, 1); |
| assertTrue(cluster.isOnSameRack(dataNodes[3], targets[0])); |
| assertFalse(cluster.isOnSameNodeGroup(dataNodes[3], targets[0])); |
| assertFalse(cluster.isOnSameRack(dataNodes[0], targets[0])); |
| |
| targets = chooseTarget(2, chosenNodes); |
| assertEquals(targets.length, 2); |
| assertTrue(cluster.isOnSameRack(dataNodes[0], targets[0])); |
| assertFalse(cluster.isOnSameNodeGroup(dataNodes[0], targets[0])); |
| |
| targets = chooseTarget(2, dataNodes[3], chosenNodes); |
| assertEquals(targets.length, 2); |
| assertTrue(cluster.isOnSameRack(dataNodes[3], targets[0])); |
| } |
| |
| /** |
| * Test for the chooseReplicaToDelete are processed based on |
| * block locality and free space |
| */ |
| @Test |
| public void testChooseReplicaToDelete() throws Exception { |
| List<DatanodeDescriptor> replicaNodeList = |
| new ArrayList<DatanodeDescriptor>(); |
| final Map<String, List<DatanodeDescriptor>> rackMap = |
| new HashMap<String, List<DatanodeDescriptor>>(); |
| dataNodes[0].setRemaining(4*1024*1024); |
| replicaNodeList.add(dataNodes[0]); |
| |
| dataNodes[1].setRemaining(3*1024*1024); |
| replicaNodeList.add(dataNodes[1]); |
| |
| dataNodes[2].setRemaining(2*1024*1024); |
| replicaNodeList.add(dataNodes[2]); |
| |
| dataNodes[5].setRemaining(1*1024*1024); |
| replicaNodeList.add(dataNodes[5]); |
| |
| List<DatanodeDescriptor> first = new ArrayList<DatanodeDescriptor>(); |
| List<DatanodeDescriptor> second = new ArrayList<DatanodeDescriptor>(); |
| replicator.splitNodesWithRack( |
| replicaNodeList, rackMap, first, second); |
| assertEquals(3, first.size()); |
| assertEquals(1, second.size()); |
| DatanodeDescriptor chosenNode = replicator.chooseReplicaToDelete( |
| null, null, (short)3, first, second); |
| // Within first set {dataNodes[0], dataNodes[1], dataNodes[2]}, |
| // dataNodes[0] and dataNodes[1] are in the same nodegroup, |
| // but dataNodes[1] is chosen as less free space |
| assertEquals(chosenNode, dataNodes[1]); |
| |
| replicator.adjustSetsWithChosenReplica(rackMap, first, second, chosenNode); |
| assertEquals(2, first.size()); |
| assertEquals(1, second.size()); |
| // Within first set {dataNodes[0], dataNodes[2]}, dataNodes[2] is chosen |
| // as less free space |
| chosenNode = replicator.chooseReplicaToDelete( |
| null, null, (short)2, first, second); |
| assertEquals(chosenNode, dataNodes[2]); |
| |
| replicator.adjustSetsWithChosenReplica(rackMap, first, second, chosenNode); |
| assertEquals(0, first.size()); |
| assertEquals(2, second.size()); |
| // Within second set, dataNodes[5] with less free space |
| chosenNode = replicator.chooseReplicaToDelete( |
| null, null, (short)1, first, second); |
| assertEquals(chosenNode, dataNodes[5]); |
| } |
| |
| /** |
| * Test replica placement policy in case of boundary topology. |
| * Rack 2 has only 1 node group & can't be placed with two replicas |
| * The 1st replica will be placed on writer. |
| * The 2nd replica should be placed on a different rack |
| * The 3rd replica should be placed on the same rack with writer, but on a |
| * different node group. |
| */ |
| @Test |
| public void testChooseTargetsOnBoundaryTopology() throws Exception { |
| for(int i=0; i<NUM_OF_DATANODES; i++) { |
| cluster.remove(dataNodes[i]); |
| } |
| |
| for(int i=0; i<NUM_OF_DATANODES_BOUNDARY; i++) { |
| cluster.add(dataNodesInBoundaryCase[i]); |
| } |
| for(int i=0; i<NUM_OF_DATANODES_BOUNDARY; i++) { |
| dataNodes[0].updateHeartbeat( |
| 2*HdfsConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, |
| (HdfsConstants.MIN_BLOCKS_FOR_WRITE-1)*BLOCK_SIZE, 0L, 0, 0); |
| |
| dataNodesInBoundaryCase[i].updateHeartbeat( |
| 2*HdfsConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, |
| 2*HdfsConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, 0, 0); |
| } |
| |
| DatanodeDescriptor[] targets; |
| targets = chooseTarget(0, dataNodesInBoundaryCase[0]); |
| assertEquals(targets.length, 0); |
| |
| targets = chooseTarget(1, dataNodesInBoundaryCase[0]); |
| assertEquals(targets.length, 1); |
| |
| targets = chooseTarget(2, dataNodesInBoundaryCase[0]); |
| assertEquals(targets.length, 2); |
| assertFalse(cluster.isOnSameRack(targets[0], targets[1])); |
| |
| targets = chooseTarget(3, dataNodesInBoundaryCase[0]); |
| assertEquals(targets.length, 3); |
| assertTrue(checkTargetsOnDifferentNodeGroup(targets)); |
| } |
| |
| /** |
| * Test re-replication policy in boundary case. |
| * Rack 2 has only one node group & the node in this node group is chosen |
| * Rack 1 has two nodegroups & one of them is chosen. |
| * Replica policy should choose the node from node group of Rack1 but not the |
| * same nodegroup with chosen nodes. |
| */ |
| @Test |
| public void testRereplicateOnBoundaryTopology() throws Exception { |
| for(int i=0; i<NUM_OF_DATANODES_BOUNDARY; i++) { |
| dataNodesInBoundaryCase[i].updateHeartbeat( |
| 2*HdfsConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, |
| 2*HdfsConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, 0, 0); |
| } |
| List<DatanodeDescriptor> chosenNodes = new ArrayList<DatanodeDescriptor>(); |
| chosenNodes.add(dataNodesInBoundaryCase[0]); |
| chosenNodes.add(dataNodesInBoundaryCase[5]); |
| DatanodeDescriptor[] targets; |
| targets = chooseTarget(1, dataNodesInBoundaryCase[0], chosenNodes); |
| assertFalse(cluster.isOnSameNodeGroup(targets[0], |
| dataNodesInBoundaryCase[0])); |
| assertFalse(cluster.isOnSameNodeGroup(targets[0], |
| dataNodesInBoundaryCase[5])); |
| assertTrue(checkTargetsOnDifferentNodeGroup(targets)); |
| } |
| |
| /** |
| * Test replica placement policy in case of targets more than number of |
| * NodeGroups. |
| * The 12-nodes cluster only has 6 NodeGroups, but in some cases, like: |
| * placing submitted job file, there is requirement to choose more (10) |
| * targets for placing replica. We should test it can return 6 targets. |
| */ |
| @Test |
| public void testChooseMoreTargetsThanNodeGroups() throws Exception { |
| for(int i=0; i<NUM_OF_DATANODES; i++) { |
| cluster.remove(dataNodes[i]); |
| } |
| for(int i=0; i<NUM_OF_DATANODES_BOUNDARY; i++) { |
| DatanodeDescriptor node = dataNodesInBoundaryCase[i]; |
| if (cluster.contains(node)) { |
| cluster.remove(node); |
| } |
| } |
| |
| for(int i=0; i<NUM_OF_DATANODES_MORE_TARGETS; i++) { |
| cluster.add(dataNodesInMoreTargetsCase[i]); |
| } |
| |
| for(int i=0; i<NUM_OF_DATANODES_MORE_TARGETS; i++) { |
| dataNodesInMoreTargetsCase[i].updateHeartbeat( |
| 2*HdfsConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, |
| 2*HdfsConstants.MIN_BLOCKS_FOR_WRITE*BLOCK_SIZE, 0L, 0, 0); |
| } |
| |
| DatanodeDescriptor[] targets; |
| // Test normal case -- 3 replicas |
| targets = chooseTarget(3, dataNodesInMoreTargetsCase[0]); |
| assertEquals(targets.length, 3); |
| assertTrue(checkTargetsOnDifferentNodeGroup(targets)); |
| |
| // Test special case -- replica number over node groups. |
| targets = chooseTarget(10, dataNodesInMoreTargetsCase[0]); |
| assertTrue(checkTargetsOnDifferentNodeGroup(targets)); |
| // Verify it only can find 6 targets for placing replicas. |
| assertEquals(targets.length, 6); |
| } |
| |
| |
| } |