zhengchenyu commented on a change in pull request #3105: URL: https://github.com/apache/hadoop/pull/3105#discussion_r652424224
########## File path: hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBusyIODataNode.java ########## @@ -0,0 +1,221 @@ +/** + * 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.datanode; + +import static org.mockito.Mockito.atLeastOnce; +import static org.mockito.Mockito.mock; +import static org.mockito.Mockito.verify; + +import java.io.IOException; +import java.lang.reflect.Field; +import java.lang.reflect.Modifier; +import java.util.Collections; +import java.util.HashSet; +import java.util.Random; +import java.util.Set; +import java.util.concurrent.TimeUnit; +import org.apache.hadoop.conf.Configuration; +import org.apache.hadoop.fs.CommonConfigurationKeys; +import org.apache.hadoop.fs.FSDataOutputStream; +import org.apache.hadoop.fs.FileSystem; +import org.apache.hadoop.fs.Path; +import org.apache.hadoop.hdfs.DFSConfigKeys; +import org.apache.hadoop.hdfs.HdfsConfiguration; +import org.apache.hadoop.hdfs.MiniDFSCluster; +import org.apache.hadoop.hdfs.protocol.ExtendedBlock; +import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo; +import org.apache.hadoop.hdfs.server.blockmanagement.BlockManager; +import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor; +import org.apache.hadoop.hdfs.server.blockmanagement.NumberReplicas; +import org.apache.hadoop.hdfs.server.namenode.FSNamesystem; +import org.apache.hadoop.hdfs.server.namenode.INodeFile; +import org.junit.After; +import org.junit.Assert; +import org.junit.Before; +import org.junit.Test; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +public class TestBusyIODataNode { + + public static final Logger LOG = LoggerFactory.getLogger(TestBusyIODataNode + .class); + + private MiniDFSCluster cluster; + private Configuration conf; + private FSNamesystem fsn; + private BlockManager bm; + + static final long SEED = 0xDEADBEEFL; + static final int BLOCK_SIZE = 8192; + private static final int HEARTBEAT_INTERVAL = 1; + + private final Path dir = new Path("/" + this.getClass().getSimpleName()); + + @Before + public void setUp() throws Exception { + conf = new HdfsConfiguration(); + conf.setTimeDuration( + DFSConfigKeys.DFS_DATANODE_DISK_CHECK_MIN_GAP_KEY, + 0, TimeUnit.MILLISECONDS); + conf.setInt(DFSConfigKeys.DFS_REPLICATION_KEY, 1); + conf.setInt( + DFSConfigKeys.DFS_NAMENODE_RECONSTRUCTION_PENDING_TIMEOUT_SEC_KEY, + 1); + conf.setInt(DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_INTERVAL_SECONDS_KEY, 1); + conf.setInt(DFSConfigKeys.DFS_BLOCKREPORT_INTERVAL_MSEC_KEY, 1000); + conf.setInt(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY, HEARTBEAT_INTERVAL); + cluster = new MiniDFSCluster.Builder(conf).numDataNodes(2).build(); + cluster.waitActive(); + fsn = cluster.getNamesystem(); + bm = fsn.getBlockManager(); + } + + @After + public void tearDown() throws Exception { + if (cluster != null) { + cluster.shutdown(); + cluster = null; + } + } + + static protected void writeFile(FileSystem fileSys, Path name, int repl) + throws IOException { + writeFile(fileSys, name, repl, 2); + } + + static protected void writeFile(FileSystem fileSys, Path name, int repl, + int numOfBlocks) throws IOException { + writeFile(fileSys, name, repl, numOfBlocks, true); + } + + static protected FSDataOutputStream writeFile(FileSystem fileSys, Path name, + int repl, int numOfBlocks, boolean completeFile) + throws IOException { + // create and write a file that contains two blocks of data + FSDataOutputStream stm = fileSys.create(name, true, fileSys.getConf() + .getInt(CommonConfigurationKeys.IO_FILE_BUFFER_SIZE_KEY, 4096), + (short) repl, BLOCK_SIZE); + byte[] buffer = new byte[BLOCK_SIZE * numOfBlocks]; + Random rand = new Random(SEED); + rand.nextBytes(buffer); + stm.write(buffer); + LOG.info("Created file " + name + " with " + repl + " replicas."); + if (completeFile) { + stm.close(); + return null; + } else { + stm.flush(); + // Do not close stream, return it + // so that it is not garbage collected + return stm; + } + } + + /* + * Wait till node is fully decommissioned. + */ + private void waitBlockMeetReplication(BlockInfo blockInfo, Short repl) { + boolean done = repl == blockInfo.numNodes(); + while (!done) { + LOG.info("Waiting for repl change to " + repl + " current repl: " + + blockInfo.numNodes()); + try { + Thread.sleep(HEARTBEAT_INTERVAL * 500); + } catch (InterruptedException e) { + // nothing + } + done = repl == blockInfo.numNodes(); + } + LOG.info("block " + blockInfo + " meet the replication " + repl); + } + + /** + * @throws Exception + */ + @Test(timeout = 300000) + public void testIOBusyNode() throws Exception { + + FileSystem fileSys = cluster.getFileSystem(0); + // 1. create file + final Path file = new Path(dir, "testFile"); + int repl = 1; + writeFile(fileSys, file, repl); + + // 2. find the datanode which store this block + final INodeFile fileNode = cluster.getNamesystem().getFSDirectory() + .getINode4Write(file.toString()).asFile(); + BlockInfo firstBlock = fileNode.getBlocks()[0]; + NumberReplicas replicas = bm.countNodes(firstBlock); + Assert.assertEquals(1, replicas.liveReplicas()); + Assert.assertEquals(1, firstBlock.numNodes()); + + // 3. make datanode io busy. we delay remove operation so that we could + // simulate that the datanode's io is busy. + DatanodeDescriptor datanode = firstBlock.getDatanode(0); + Logger log = mock(Logger.class); + for (DataNode dn : cluster.getDataNodes()) { + if (datanode.getXferPort() != dn.getXferPort()) { + continue; + } + Set<ExtendedBlock> set = Collections + .synchronizedSet(new HashSet<ExtendedBlock>() { + @Override + public boolean add(ExtendedBlock block) { + boolean ret = super.add(block); + try { + Thread.sleep(30000); + } catch (InterruptedException e) { + e.printStackTrace(); + } + return ret; + } + }); + Field transferringBlock = DataNode.class Review comment: We set DataNode.transferringBlock to sleepSet so that we could simulate that DataNode's DataTransfer will stuck. Because when decommission node, some nodes were stuck on io (network or disk), then DataTransfer will run for long time. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
