/** * 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 io.hops.common.INodeUtil; import io.hops.exception.StorageException; import io.hops.metadata.HdfsStorageFactory; import io.hops.metadata.hdfs.entity.INodeIdentifier; import io.hops.transaction.EntityManager; import io.hops.transaction.handler.HDFSOperationType; import io.hops.transaction.handler.HopsTransactionalRequestHandler; import io.hops.transaction.lock.LockFactory; import io.hops.transaction.lock.TransactionLocks; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.hdfs.DFSConfigKeys; import org.apache.hadoop.hdfs.DFSTestUtil; import org.apache.hadoop.hdfs.DFSUtil; import org.apache.hadoop.hdfs.HdfsConfiguration; import org.apache.hadoop.hdfs.MiniDFSCluster; import org.apache.hadoop.hdfs.protocol.Block; import org.apache.hadoop.hdfs.protocol.HdfsConstants; import org.apache.hadoop.hdfs.server.datanode.DataNode; import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils; import org.apache.hadoop.hdfs.server.namenode.INode; import org.apache.hadoop.hdfs.server.namenode.NameNode; import org.apache.hadoop.net.NetworkTopology; import org.apache.hadoop.net.Node; import org.apache.hadoop.util.Time; import org.apache.log4j.AppenderSkeleton; import org.apache.log4j.Level; import org.apache.log4j.Logger; import org.apache.log4j.spi.LoggingEvent; import org.junit.After; import org.junit.BeforeClass; import org.junit.Rule; import org.junit.Test; import org.junit.rules.ExpectedException; import java.io.IOException; import java.util.ArrayList; import java.util.Arrays; import java.util.HashMap; import java.util.List; import java.util.Random; import static org.junit.Assert.assertEquals; import static org.junit.Assert.assertFalse; import static org.junit.Assert.assertNotNull; import static org.junit.Assert.assertTrue; public class TestReplicationPolicy { private Random random = DFSUtil.getRandom(); private static final int BLOCK_SIZE = 1024; private static final int NUM_OF_DATANODES = 6; private static NetworkTopology cluster; private static NameNode namenode; private static BlockPlacementPolicy replicator; private static final String filename = "/dummyfile.txt"; private static DatanodeDescriptor dataNodes[]; // The interval for marking a datanode as stale, private static long staleInterval = DFSConfigKeys.DFS_NAMENODE_STALE_DATANODE_INTERVAL_DEFAULT; @Rule public ExpectedException exception = ExpectedException.none(); @BeforeClass public static void setupCluster() throws Exception { Configuration conf = new HdfsConfiguration(); dataNodes = new DatanodeDescriptor[]{ DFSTestUtil.getDatanodeDescriptor("1.1.1.1", "/d1/r1"), DFSTestUtil.getDatanodeDescriptor("2.2.2.2", "/d1/r1"), DFSTestUtil.getDatanodeDescriptor("3.3.3.3", "/d1/r2"), DFSTestUtil.getDatanodeDescriptor("4.4.4.4", "/d1/r2"), DFSTestUtil.getDatanodeDescriptor("5.5.5.5", "/d2/r3"), DFSTestUtil.getDatanodeDescriptor("6.6.6.6", "/d2/r3")}; FileSystem.setDefaultUri(conf, "hdfs://localhost:0"); conf.set(DFSConfigKeys.DFS_NAMENODE_HTTP_ADDRESS_KEY, "0.0.0.0:0"); conf.setBoolean( DFSConfigKeys.DFS_NAMENODE_AVOID_STALE_DATANODE_FOR_READ_KEY, true); conf.setBoolean( DFSConfigKeys.DFS_NAMENODE_AVOID_STALE_DATANODE_FOR_WRITE_KEY, true); conf.setInt(DFSConfigKeys.DFS_NAMENODE_REPLICATION_INTERVAL_KEY, 10); 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]); bm.getDatanodeManager().getHeartbeatManager().addDatanode(dataNodes[i]); } 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); } } @After public void tearDown() { if (namenode != null) { namenode.stop(); } } /** * 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 * 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 = replicator.chooseTarget(filename, 0, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 0); targets = replicator.chooseTarget(filename, 1, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 1); assertEquals(targets[0], dataNodes[0]); targets = replicator.chooseTarget(filename, 2, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 2); assertEquals(targets[0], dataNodes[0]); assertFalse(cluster.isOnSameRack(targets[0], targets[1])); targets = replicator.chooseTarget(filename, 3, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 3); assertEquals(targets[0], dataNodes[0]); assertFalse(cluster.isOnSameRack(targets[0], targets[1])); assertTrue(cluster.isOnSameRack(targets[1], targets[2])); targets = replicator.chooseTarget(filename, 4, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); 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])); dataNodes[0] .updateHeartbeat(2 * HdfsConstants.MIN_BLOCKS_FOR_WRITE * BLOCK_SIZE, 0L, HdfsConstants.MIN_BLOCKS_FOR_WRITE * BLOCK_SIZE, 0L, 0, 0); } private static DatanodeDescriptor[] chooseTarget( BlockPlacementPolicyDefault policy, int numOfReplicas, DatanodeDescriptor writer, List<DatanodeDescriptor> chosenNodes, HashMap<Node, Node> excludedNodes, long blocksize) { return policy .chooseTarget(numOfReplicas, writer, chosenNodes, false, excludedNodes, blocksize); } /** * 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, and the rest * should be placed on a third rack. * * @throws Exception */ @Test public void testChooseTarget2() throws Exception { HashMap<Node, Node> excludedNodes; DatanodeDescriptor[] targets; BlockPlacementPolicyDefault repl = (BlockPlacementPolicyDefault) replicator; List<DatanodeDescriptor> chosenNodes = new ArrayList<DatanodeDescriptor>(); excludedNodes = new HashMap<Node, Node>(); excludedNodes.put(dataNodes[1], dataNodes[1]); targets = chooseTarget(repl, 0, dataNodes[0], chosenNodes, excludedNodes, BLOCK_SIZE); assertEquals(targets.length, 0); excludedNodes.clear(); chosenNodes.clear(); excludedNodes.put(dataNodes[1], dataNodes[1]); targets = chooseTarget(repl, 1, dataNodes[0], chosenNodes, excludedNodes, BLOCK_SIZE); assertEquals(targets.length, 1); assertEquals(targets[0], dataNodes[0]); excludedNodes.clear(); chosenNodes.clear(); excludedNodes.put(dataNodes[1], dataNodes[1]); targets = chooseTarget(repl, 2, dataNodes[0], chosenNodes, excludedNodes, BLOCK_SIZE); assertEquals(targets.length, 2); assertEquals(targets[0], dataNodes[0]); assertFalse(cluster.isOnSameRack(targets[0], targets[1])); excludedNodes.clear(); chosenNodes.clear(); excludedNodes.put(dataNodes[1], dataNodes[1]); targets = chooseTarget(repl, 3, dataNodes[0], chosenNodes, excludedNodes, BLOCK_SIZE); assertEquals(targets.length, 3); assertEquals(targets[0], dataNodes[0]); assertFalse(cluster.isOnSameRack(targets[0], targets[1])); assertTrue(cluster.isOnSameRack(targets[1], targets[2])); excludedNodes.clear(); chosenNodes.clear(); excludedNodes.put(dataNodes[1], dataNodes[1]); targets = chooseTarget(repl, 4, dataNodes[0], chosenNodes, excludedNodes, BLOCK_SIZE); assertEquals(targets.length, 4); assertEquals(targets[0], dataNodes[0]); for (int i = 1; i < 4; i++) { assertFalse(cluster.isOnSameRack(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.put(dataNodes[1], dataNodes[1]); chosenNodes.add(dataNodes[2]); targets = repl.chooseTarget(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, * 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 = replicator.chooseTarget(filename, 0, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 0); targets = replicator.chooseTarget(filename, 1, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 1); assertEquals(targets[0], dataNodes[1]); targets = replicator.chooseTarget(filename, 2, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 2); assertEquals(targets[0], dataNodes[1]); assertFalse(cluster.isOnSameRack(targets[0], targets[1])); targets = replicator.chooseTarget(filename, 3, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 3); assertEquals(targets[0], dataNodes[1]); assertTrue(cluster.isOnSameRack(targets[1], targets[2])); assertFalse(cluster.isOnSameRack(targets[0], targets[1])); targets = replicator.chooseTarget(filename, 4, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 4); assertEquals(targets[0], dataNodes[1]); for (int i = 1; i < 4; i++) { assertFalse(cluster.isOnSameRack(targets[0], targets[i])); } assertTrue(cluster.isOnSameRack(targets[1], targets[2]) || cluster.isOnSameRack(targets[2], targets[3])); assertFalse(cluster.isOnSameRack(targets[1], 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, * * @throws Exception */ @Test public void testChoooseTarget4() throws Exception { // make data node 0 & 1 to be not qualified to choose: not enough disk space for (int i = 0; i < 2; 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 = replicator.chooseTarget(filename, 0, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 0); targets = replicator.chooseTarget(filename, 1, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 1); assertFalse(cluster.isOnSameRack(targets[0], dataNodes[0])); targets = replicator.chooseTarget(filename, 2, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 2); assertFalse(cluster.isOnSameRack(targets[0], dataNodes[0])); assertFalse(cluster.isOnSameRack(targets[0], targets[1])); targets = replicator.chooseTarget(filename, 3, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 3); for (int i = 0; i < 3; i++) { assertFalse(cluster.isOnSameRack(targets[i], dataNodes[0])); } assertTrue(cluster.isOnSameRack(targets[0], targets[1]) || cluster.isOnSameRack(targets[1], targets[2])); assertFalse(cluster.isOnSameRack(targets[0], targets[2])); for (int i = 0; i < 2; i++) { dataNodes[i] .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 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 { DatanodeDescriptor writerDesc = DFSTestUtil.getDatanodeDescriptor("7.7.7.7", "/d2/r4"); DatanodeDescriptor[] targets; targets = replicator.chooseTarget(filename, 0, writerDesc, new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 0); targets = replicator.chooseTarget(filename, 1, writerDesc, new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 1); targets = replicator.chooseTarget(filename, 2, writerDesc, new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 2); assertFalse(cluster.isOnSameRack(targets[0], targets[1])); targets = replicator.chooseTarget(filename, 3, writerDesc, new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 3); assertTrue(cluster.isOnSameRack(targets[1], targets[2])); assertFalse(cluster.isOnSameRack(targets[0], targets[1])); } /** * In this testcase, it tries to choose more targets than available nodes and * check the result, with stale node avoidance on the write path enabled. * * @throws Exception */ @Test public void testChooseTargetWithMoreThanAvailableNodesWithStaleness() throws Exception { try { namenode.getNamesystem().getBlockManager().getDatanodeManager() .setNumStaleNodes(NUM_OF_DATANODES); testChooseTargetWithMoreThanAvailableNodes(); } finally { namenode.getNamesystem().getBlockManager().getDatanodeManager() .setNumStaleNodes(0); } } /** * In this testcase, it tries to choose more targets than available nodes and * check the result. * * @throws Exception */ @Test public void testChooseTargetWithMoreThanAvailableNodes() throws Exception { // make data node 0 & 1 to be not qualified to choose: not enough disk space for (int i = 0; i < 2; i++) { dataNodes[i] .updateHeartbeat(2 * HdfsConstants.MIN_BLOCKS_FOR_WRITE * BLOCK_SIZE, 0L, (HdfsConstants.MIN_BLOCKS_FOR_WRITE - 1) * BLOCK_SIZE, 0L, 0, 0); } final TestAppender appender = new TestAppender(); final Logger logger = Logger.getRootLogger(); logger.addAppender(appender); // try to choose NUM_OF_DATANODES which is more than actually available // nodes. DatanodeDescriptor[] targets = replicator .chooseTarget(filename, NUM_OF_DATANODES, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, NUM_OF_DATANODES - 2); final List<LoggingEvent> log = appender.getLog(); assertNotNull(log); assertFalse(log.size() == 0); final LoggingEvent lastLogEntry = log.get(log.size() - 1); assertEquals(lastLogEntry.getLevel(), Level.WARN); // Suppose to place replicas on each node but two data nodes are not // available for placing replica, so here we expect a short of 2 assertTrue(((String) lastLogEntry.getMessage()).contains("in need of 2")); for (int i = 0; i < 2; i++) { dataNodes[i] .updateHeartbeat(2 * HdfsConstants.MIN_BLOCKS_FOR_WRITE * BLOCK_SIZE, 0L, HdfsConstants.MIN_BLOCKS_FOR_WRITE * BLOCK_SIZE, 0L, 0, 0); } } class TestAppender extends AppenderSkeleton { private final List<LoggingEvent> log = new ArrayList<LoggingEvent>(); @Override public boolean requiresLayout() { return false; } @Override protected void append(final LoggingEvent loggingEvent) { log.add(loggingEvent); } @Override public void close() { } public List<LoggingEvent> getLog() { return new ArrayList<LoggingEvent>(log); } } private boolean containsWithinRange(DatanodeDescriptor target, DatanodeDescriptor[] nodes, int startIndex, int endIndex) { assert startIndex >= 0 && startIndex < nodes.length; assert endIndex >= startIndex && endIndex < nodes.length; for (int i = startIndex; i <= endIndex; i++) { if (nodes[i].equals(target)) { return true; } } return false; } @Test public void testChooseTargetWithStaleNodes() throws Exception { // Set dataNodes[0] as stale dataNodes[0].setLastUpdate(Time.now() - staleInterval - 1); namenode.getNamesystem().getBlockManager().getDatanodeManager() .getHeartbeatManager().heartbeatCheck(); assertTrue(namenode.getNamesystem().getBlockManager().getDatanodeManager() .shouldAvoidStaleDataNodesForWrite()); DatanodeDescriptor[] targets; // We set the datanode[0] as stale, thus should choose datanode[1] since // datanode[1] is on the same rack with datanode[0] (writer) targets = replicator.chooseTarget(filename, 1, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 1); assertEquals(targets[0], dataNodes[1]); HashMap<Node, Node> excludedNodes = new HashMap<Node, Node>(); excludedNodes.put(dataNodes[1], dataNodes[1]); List<DatanodeDescriptor> chosenNodes = new ArrayList<DatanodeDescriptor>(); BlockPlacementPolicyDefault repl = (BlockPlacementPolicyDefault) replicator; targets = chooseTarget(repl, 1, dataNodes[0], chosenNodes, excludedNodes, BLOCK_SIZE); assertEquals(targets.length, 1); assertFalse(cluster.isOnSameRack(targets[0], dataNodes[0])); // reset dataNodes[0].setLastUpdate(Time.now()); namenode.getNamesystem().getBlockManager().getDatanodeManager() .getHeartbeatManager().heartbeatCheck(); } /** * In this testcase, we set 3 nodes (dataNodes[0] ~ dataNodes[2]) as stale, * and when the number of replicas is less or equal to 3, all the healthy * datanodes should be returned by the chooseTarget method. When the number * of replicas is 4, a stale node should be included. * * @throws Exception */ @Test public void testChooseTargetWithHalfStaleNodes() throws Exception { // Set dataNodes[0], dataNodes[1], and dataNodes[2] as stale for (int i = 0; i < 3; i++) { dataNodes[i].setLastUpdate(Time.now() - staleInterval - 1); } namenode.getNamesystem().getBlockManager().getDatanodeManager() .getHeartbeatManager().heartbeatCheck(); DatanodeDescriptor[] targets; targets = replicator.chooseTarget(filename, 0, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 0); // Since we have 6 datanodes total, stale nodes should // not be returned until we ask for more than 3 targets targets = replicator.chooseTarget(filename, 1, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 1); assertFalse(containsWithinRange(targets[0], dataNodes, 0, 2)); targets = replicator.chooseTarget(filename, 2, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 2); assertFalse(containsWithinRange(targets[0], dataNodes, 0, 2)); assertFalse(containsWithinRange(targets[1], dataNodes, 0, 2)); targets = replicator.chooseTarget(filename, 3, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 3); assertTrue(containsWithinRange(targets[0], dataNodes, 3, 5)); assertTrue(containsWithinRange(targets[1], dataNodes, 3, 5)); assertTrue(containsWithinRange(targets[2], dataNodes, 3, 5)); targets = replicator.chooseTarget(filename, 4, dataNodes[0], new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 4); assertTrue(containsWithinRange(dataNodes[3], targets, 0, 3)); assertTrue(containsWithinRange(dataNodes[4], targets, 0, 3)); assertTrue(containsWithinRange(dataNodes[5], targets, 0, 3)); for (int i = 0; i < dataNodes.length; i++) { dataNodes[i].setLastUpdate(Time.now()); } namenode.getNamesystem().getBlockManager().getDatanodeManager() .getHeartbeatManager().heartbeatCheck(); } @Test public void testChooseTargetWithMoreThanHalfStaleNodes() throws Exception { HdfsConfiguration conf = new HdfsConfiguration(); conf.setBoolean( DFSConfigKeys.DFS_NAMENODE_AVOID_STALE_DATANODE_FOR_WRITE_KEY, true); String[] hosts = new String[]{"host1", "host2", "host3", "host4", "host5", "host6"}; String[] racks = new String[]{"/d1/r1", "/d1/r1", "/d1/r2", "/d1/r2", "/d2/r3", "/d2/r3"}; MiniDFSCluster miniCluster = new MiniDFSCluster.Builder(conf).racks(racks).hosts(hosts) .numDataNodes(hosts.length).build(); miniCluster.waitActive(); try { // Step 1. Make two datanodes as stale, check whether the // avoidStaleDataNodesForWrite calculation is correct. // First stop the heartbeat of host1 and host2 for (int i = 0; i < 2; i++) { DataNode dn = miniCluster.getDataNodes().get(i); DataNodeTestUtils.setHeartbeatsDisabledForTests(dn, true); miniCluster.getNameNode().getNamesystem().getBlockManager() .getDatanodeManager().getDatanode(dn.getDatanodeId()) .setLastUpdate(Time.now() - staleInterval - 1); } // Instead of waiting, explicitly call heartbeatCheck to // let heartbeat manager to detect stale nodes miniCluster.getNameNode().getNamesystem().getBlockManager() .getDatanodeManager().getHeartbeatManager().heartbeatCheck(); int numStaleNodes = miniCluster.getNameNode().getNamesystem().getBlockManager() .getDatanodeManager().getNumStaleNodes(); assertEquals(numStaleNodes, 2); assertTrue(miniCluster.getNameNode().getNamesystem().getBlockManager() .getDatanodeManager().shouldAvoidStaleDataNodesForWrite()); // Call chooseTarget DatanodeDescriptor staleNodeInfo = miniCluster.getNameNode().getNamesystem().getBlockManager() .getDatanodeManager() .getDatanode(miniCluster.getDataNodes().get(0).getDatanodeId()); BlockPlacementPolicy replicator = miniCluster.getNameNode().getNamesystem().getBlockManager() .getBlockPlacementPolicy(); DatanodeDescriptor[] targets = replicator .chooseTarget(filename, 3, staleNodeInfo, new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 3); assertFalse(cluster.isOnSameRack(targets[0], staleNodeInfo)); // Step 2. Set more than half of the datanodes as stale for (int i = 0; i < 4; i++) { DataNode dn = miniCluster.getDataNodes().get(i); DataNodeTestUtils.setHeartbeatsDisabledForTests(dn, true); miniCluster.getNameNode().getNamesystem().getBlockManager() .getDatanodeManager().getDatanode(dn.getDatanodeId()) .setLastUpdate(Time.now() - staleInterval - 1); } // Explicitly call heartbeatCheck miniCluster.getNameNode().getNamesystem().getBlockManager() .getDatanodeManager().getHeartbeatManager().heartbeatCheck(); numStaleNodes = miniCluster.getNameNode().getNamesystem().getBlockManager() .getDatanodeManager().getNumStaleNodes(); assertEquals(numStaleNodes, 4); // According to our strategy, stale datanodes will be included for writing // to avoid hotspots assertFalse(miniCluster.getNameNode().getNamesystem().getBlockManager() .getDatanodeManager().shouldAvoidStaleDataNodesForWrite()); // Call chooseTarget targets = replicator.chooseTarget(filename, 3, staleNodeInfo, new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 3); assertTrue(cluster.isOnSameRack(targets[0], staleNodeInfo)); // Step 3. Set 2 stale datanodes back to healthy nodes, // still have 2 stale nodes for (int i = 2; i < 4; i++) { DataNode dn = miniCluster.getDataNodes().get(i); DataNodeTestUtils.setHeartbeatsDisabledForTests(dn, false); miniCluster.getNameNode().getNamesystem().getBlockManager() .getDatanodeManager().getDatanode(dn.getDatanodeId()) .setLastUpdate(Time.now()); } // Explicitly call heartbeatCheck miniCluster.getNameNode().getNamesystem().getBlockManager() .getDatanodeManager().getHeartbeatManager().heartbeatCheck(); numStaleNodes = miniCluster.getNameNode().getNamesystem().getBlockManager() .getDatanodeManager().getNumStaleNodes(); assertEquals(numStaleNodes, 2); assertTrue(miniCluster.getNameNode().getNamesystem().getBlockManager() .getDatanodeManager().shouldAvoidStaleDataNodesForWrite()); // Call chooseTarget targets = replicator.chooseTarget(filename, 3, staleNodeInfo, new ArrayList<DatanodeDescriptor>(), BLOCK_SIZE); assertEquals(targets.length, 3); assertFalse(cluster.isOnSameRack(targets[0], staleNodeInfo)); } finally { miniCluster.shutdown(); } } /** * 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 by same rack as * the 1st replica. The 3rd replica can be placed randomly. * * @throws Exception */ @Test public void testRereplicate1() throws Exception { List<DatanodeDescriptor> chosenNodes = new ArrayList<DatanodeDescriptor>(); chosenNodes.add(dataNodes[0]); DatanodeDescriptor[] targets; targets = replicator .chooseTarget(filename, 0, dataNodes[0], chosenNodes, BLOCK_SIZE); assertEquals(targets.length, 0); targets = replicator .chooseTarget(filename, 1, dataNodes[0], chosenNodes, BLOCK_SIZE); assertEquals(targets.length, 1); assertFalse(cluster.isOnSameRack(dataNodes[0], targets[0])); targets = replicator .chooseTarget(filename, 2, dataNodes[0], chosenNodes, BLOCK_SIZE); assertEquals(targets.length, 2); assertTrue(cluster.isOnSameRack(dataNodes[0], targets[0])); assertFalse(cluster.isOnSameRack(targets[0], targets[1])); targets = replicator .chooseTarget(filename, 3, dataNodes[0], chosenNodes, BLOCK_SIZE); assertEquals(targets.length, 3); assertTrue(cluster.isOnSameRack(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 than rack 1. * the rest replicas can be placed randomly, * * @throws Exception */ @Test public void testRereplicate2() throws Exception { List<DatanodeDescriptor> chosenNodes = new ArrayList<DatanodeDescriptor>(); chosenNodes.add(dataNodes[0]); chosenNodes.add(dataNodes[1]); DatanodeDescriptor[] targets; targets = replicator .chooseTarget(filename, 0, dataNodes[0], chosenNodes, BLOCK_SIZE); assertEquals(targets.length, 0); targets = replicator .chooseTarget(filename, 1, dataNodes[0], chosenNodes, BLOCK_SIZE); assertEquals(targets.length, 1); assertFalse(cluster.isOnSameRack(dataNodes[0], targets[0])); targets = replicator .chooseTarget(filename, 2, dataNodes[0], chosenNodes, BLOCK_SIZE); assertEquals(targets.length, 2); assertFalse(cluster.isOnSameRack(dataNodes[0], targets[0])); assertFalse(cluster.isOnSameRack(dataNodes[0], targets[1])); } /** * This testcase tests re-replication, * when dataNodes[0] and dataNodes[2] 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 { List<DatanodeDescriptor> chosenNodes = new ArrayList<DatanodeDescriptor>(); chosenNodes.add(dataNodes[0]); chosenNodes.add(dataNodes[2]); DatanodeDescriptor[] targets; targets = replicator .chooseTarget(filename, 0, dataNodes[0], chosenNodes, BLOCK_SIZE); assertEquals(targets.length, 0); targets = replicator .chooseTarget(filename, 1, dataNodes[0], chosenNodes, BLOCK_SIZE); assertEquals(targets.length, 1); assertTrue(cluster.isOnSameRack(dataNodes[0], targets[0])); assertFalse(cluster.isOnSameRack(dataNodes[2], targets[0])); targets = replicator .chooseTarget(filename, 1, dataNodes[2], chosenNodes, BLOCK_SIZE); assertEquals(targets.length, 1); assertTrue(cluster.isOnSameRack(dataNodes[2], targets[0])); assertFalse(cluster.isOnSameRack(dataNodes[0], targets[0])); targets = replicator .chooseTarget(filename, 2, dataNodes[0], chosenNodes, BLOCK_SIZE); assertEquals(targets.length, 2); assertTrue(cluster.isOnSameRack(dataNodes[0], targets[0])); targets = replicator .chooseTarget(filename, 2, dataNodes[2], chosenNodes, BLOCK_SIZE); assertEquals(targets.length, 2); assertTrue(cluster.isOnSameRack(dataNodes[2], targets[0])); } /** * Test for the high priority blocks are processed before the low priority * blocks. */ @Test(timeout = 60000) public void testReplicationWithPriority() throws Exception { int DFS_NAMENODE_REPLICATION_INTERVAL = 1000; int HIGH_PRIORITY = 0; Configuration conf = new Configuration(); conf.setInt(DFSConfigKeys.DFS_NAMENODE_REPLICATION_INTERVAL_KEY, 1); MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(2).format(true).build(); try { cluster.waitActive(); final UnderReplicatedBlocks neededReplications = cluster.getNameNode().getNamesystem() .getBlockManager().neededReplications; for (int i = 0; i < 100; i++) { // Adding the blocks directly to normal priority int blkId = random.nextInt(); add(neededReplications, new BlockInfo(new Block(blkId), blkId), 2, 0, 3); } // Lets wait for the replication interval, to start process normal // priority blocks Thread.sleep(DFS_NAMENODE_REPLICATION_INTERVAL); // Adding the block directly to high priority list int blkId = random.nextInt(); add(neededReplications, new BlockInfo(new Block(blkId), blkId), 1, 0, 3); // Lets wait for the replication interval Thread.sleep(3 * DFS_NAMENODE_REPLICATION_INTERVAL); // Check replication completed successfully. Need not wait till it process // all the 100 normal blocks. assertFalse("Not able to clear the element from high priority list", neededReplications.iterator(HIGH_PRIORITY).hasNext()); } finally { cluster.shutdown(); } } /** * Test for the ChooseUnderReplicatedBlocks are processed based on priority */ @Test public void testChooseUnderReplicatedBlocks() throws Exception { HdfsStorageFactory.formatStorage(); int blockID = 0; UnderReplicatedBlocks underReplicatedBlocks = new UnderReplicatedBlocks(); for (int i = 0; i < 5; i++) { // Adding QUEUE_HIGHEST_PRIORITY block int blockIdTmp = blockID++; add(underReplicatedBlocks, new BlockInfo(new Block(blockIdTmp), blockIdTmp), 1, 0, 3); // Adding QUEUE_VERY_UNDER_REPLICATED block blockIdTmp = blockID++; add(underReplicatedBlocks, new BlockInfo(new Block(blockIdTmp), blockIdTmp), 2, 0, 7); // Adding QUEUE_REPLICAS_BADLY_DISTRIBUTED block blockIdTmp = blockID++; add(underReplicatedBlocks, new BlockInfo(new Block(blockIdTmp), blockIdTmp), 6, 0, 6); // Adding QUEUE_UNDER_REPLICATED block blockIdTmp = blockID++; add(underReplicatedBlocks, new BlockInfo(new Block(blockIdTmp), blockIdTmp), 5, 0, 6); // Adding QUEUE_WITH_CORRUPT_BLOCKS block blockIdTmp = blockID++; add(underReplicatedBlocks, new BlockInfo(new Block(blockIdTmp), blockIdTmp), 0, 0, 3); } // Choose 6 blocks from UnderReplicatedBlocks. Then it should pick 5 blocks // from // QUEUE_HIGHEST_PRIORITY and 1 block from QUEUE_VERY_UNDER_REPLICATED. List<List<Block>> chosenBlocks = underReplicatedBlocks.chooseUnderReplicatedBlocks(6); assertTheChosenBlocks(chosenBlocks, 5, 1, 0, 0, 0); // Choose 10 blocks from UnderReplicatedBlocks. Then it should pick 4 blocks from // QUEUE_VERY_UNDER_REPLICATED, 5 blocks from QUEUE_UNDER_REPLICATED and 1 // block from QUEUE_REPLICAS_BADLY_DISTRIBUTED. chosenBlocks = underReplicatedBlocks.chooseUnderReplicatedBlocks(10); assertTheChosenBlocks(chosenBlocks, 0, 4, 5, 1, 0); // Adding QUEUE_HIGHEST_PRIORITY int blockIdTmp = blockID++; add(underReplicatedBlocks, new BlockInfo(new Block(blockIdTmp), blockIdTmp), 1, 0, 3); // Choose 10 blocks from UnderReplicatedBlocks. Then it should pick 1 block from // QUEUE_HIGHEST_PRIORITY, 4 blocks from QUEUE_REPLICAS_BADLY_DISTRIBUTED // and 5 blocks from QUEUE_WITH_CORRUPT_BLOCKS. chosenBlocks = underReplicatedBlocks.chooseUnderReplicatedBlocks(10); assertTheChosenBlocks(chosenBlocks, 1, 0, 0, 4, 5); // Since it is reached to end of all lists, // should start picking the blocks from start. // Choose 7 blocks from UnderReplicatedBlocks. Then it should pick 6 blocks from // QUEUE_HIGHEST_PRIORITY, 1 block from QUEUE_VERY_UNDER_REPLICATED. chosenBlocks = underReplicatedBlocks.chooseUnderReplicatedBlocks(7); assertTheChosenBlocks(chosenBlocks, 6, 1, 0, 0, 0); } /** * asserts the chosen blocks with expected priority blocks */ private void assertTheChosenBlocks(List<List<Block>> chosenBlocks, int firstPrioritySize, int secondPrioritySize, int thirdPrioritySize, int fourthPrioritySize, int fifthPrioritySize) { assertEquals( "Not returned the expected number of QUEUE_HIGHEST_PRIORITY blocks", firstPrioritySize, chosenBlocks.get(UnderReplicatedBlocks.QUEUE_HIGHEST_PRIORITY).size()); assertEquals( "Not returned the expected number of QUEUE_VERY_UNDER_REPLICATED blocks", secondPrioritySize, chosenBlocks.get(UnderReplicatedBlocks.QUEUE_VERY_UNDER_REPLICATED) .size()); assertEquals( "Not returned the expected number of QUEUE_UNDER_REPLICATED blocks", thirdPrioritySize, chosenBlocks.get(UnderReplicatedBlocks.QUEUE_UNDER_REPLICATED).size()); assertEquals( "Not returned the expected number of QUEUE_REPLICAS_BADLY_DISTRIBUTED blocks", fourthPrioritySize, chosenBlocks.get(UnderReplicatedBlocks.QUEUE_REPLICAS_BADLY_DISTRIBUTED) .size()); assertEquals( "Not returned the expected number of QUEUE_WITH_CORRUPT_BLOCKS blocks", fifthPrioritySize, chosenBlocks.get(UnderReplicatedBlocks.QUEUE_WITH_CORRUPT_BLOCKS) .size()); } /** * This testcase tests whether the default value returned by * DFSUtil.getInvalidateWorkPctPerIteration() is positive, * and whether an IllegalArgumentException will be thrown * when 0.0f is retrieved */ @Test public void testGetInvalidateWorkPctPerIteration() { Configuration conf = new Configuration(); float blocksInvalidateWorkPct = DFSUtil.getInvalidateWorkPctPerIteration(conf); assertTrue(blocksInvalidateWorkPct > 0); conf.set(DFSConfigKeys.DFS_NAMENODE_INVALIDATE_WORK_PCT_PER_ITERATION, "0.5f"); blocksInvalidateWorkPct = DFSUtil.getInvalidateWorkPctPerIteration(conf); assertEquals(blocksInvalidateWorkPct, 0.5f, blocksInvalidateWorkPct * 1e-7); conf.set(DFSConfigKeys. DFS_NAMENODE_INVALIDATE_WORK_PCT_PER_ITERATION, "1.0f"); blocksInvalidateWorkPct = DFSUtil.getInvalidateWorkPctPerIteration(conf); assertEquals(blocksInvalidateWorkPct, 1.0f, blocksInvalidateWorkPct * 1e-7); conf.set(DFSConfigKeys. DFS_NAMENODE_INVALIDATE_WORK_PCT_PER_ITERATION, "0.0f"); exception.expect(IllegalArgumentException.class); blocksInvalidateWorkPct = DFSUtil.getInvalidateWorkPctPerIteration(conf); } /** * This testcase tests whether an IllegalArgumentException * will be thrown when a negative value is retrieved by * DFSUtil#getInvalidateWorkPctPerIteration */ @Test public void testGetInvalidateWorkPctPerIteration_NegativeValue() { Configuration conf = new Configuration(); float blocksInvalidateWorkPct = DFSUtil.getInvalidateWorkPctPerIteration(conf); assertTrue(blocksInvalidateWorkPct > 0); conf.set(DFSConfigKeys. DFS_NAMENODE_INVALIDATE_WORK_PCT_PER_ITERATION, "-0.5f"); exception.expect(IllegalArgumentException.class); blocksInvalidateWorkPct = DFSUtil.getInvalidateWorkPctPerIteration(conf); } /** * This testcase tests whether an IllegalArgumentException * will be thrown when a value greater than 1 is retrieved by * DFSUtil#getInvalidateWorkPctPerIteration */ @Test public void testGetInvalidateWorkPctPerIteration_GreaterThanOne() { Configuration conf = new Configuration(); float blocksInvalidateWorkPct = DFSUtil.getInvalidateWorkPctPerIteration(conf); assertTrue(blocksInvalidateWorkPct > 0); conf.set(DFSConfigKeys. DFS_NAMENODE_INVALIDATE_WORK_PCT_PER_ITERATION, "1.5f"); exception.expect(IllegalArgumentException.class); blocksInvalidateWorkPct = DFSUtil.getInvalidateWorkPctPerIteration(conf); } /** * This testcase tests whether the value returned by * DFSUtil.getReplWorkMultiplier() is positive, * and whether an IllegalArgumentException will be thrown * when a non-positive value is retrieved */ @Test public void testGetReplWorkMultiplier() { Configuration conf = new Configuration(); int blocksReplWorkMultiplier = DFSUtil.getReplWorkMultiplier(conf); assertTrue(blocksReplWorkMultiplier > 0); conf.set(DFSConfigKeys. DFS_NAMENODE_REPLICATION_WORK_MULTIPLIER_PER_ITERATION, "3"); blocksReplWorkMultiplier = DFSUtil.getReplWorkMultiplier(conf); assertEquals(blocksReplWorkMultiplier, 3); conf.set(DFSConfigKeys. DFS_NAMENODE_REPLICATION_WORK_MULTIPLIER_PER_ITERATION, "-1"); exception.expect(IllegalArgumentException.class); blocksReplWorkMultiplier = DFSUtil.getReplWorkMultiplier(conf); } private boolean add(final UnderReplicatedBlocks queue, final BlockInfo block, final int curReplicas, final int decomissionedReplicas, final int expectedReplicas) throws IOException { return (Boolean) new HopsTransactionalRequestHandler( HDFSOperationType.TEST) { INodeIdentifier inodeIdentifier; @Override public void setUp() throws StorageException, IOException { inodeIdentifier = INodeUtil.resolveINodeFromBlock(block); } @Override public void acquireLock(TransactionLocks locks) throws IOException { LockFactory lf = LockFactory.getInstance(); locks .add(lf.getIndividualBlockLock(block.getBlockId(), inodeIdentifier)) .add(lf.getBlockRelated(LockFactory.BLK.UR)); } @Override public Object performTask() throws StorageException, IOException { EntityManager.add(new BlockInfo(block, inodeIdentifier != null ? inodeIdentifier.getInodeId() : INode.NON_EXISTING_ID)); return queue .add(block, curReplicas, decomissionedReplicas, expectedReplicas); } }.handle(); } }