| /** |
| * 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.namenode; |
| |
| import java.util.Collection; |
| import java.util.Iterator; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hdfs.DFSTestUtil; |
| import org.apache.hadoop.hdfs.HdfsConfiguration; |
| import org.apache.hadoop.hdfs.MiniDFSCluster; |
| import org.apache.hadoop.hdfs.MiniDFSCluster.DataNodeProperties; |
| import org.apache.hadoop.hdfs.protocol.Block; |
| import org.apache.hadoop.hdfs.server.namenode.FSNamesystem.NumberReplicas; |
| |
| import junit.framework.TestCase; |
| |
| /** |
| * Test if live nodes count per node is correct |
| * so NN makes right decision for under/over-replicated blocks |
| */ |
| public class TestNodeCount extends TestCase { |
| public void testNodeCount() throws Exception { |
| // start a mini dfs cluster of 2 nodes |
| final Configuration conf = new HdfsConfiguration(); |
| final short REPLICATION_FACTOR = (short)2; |
| final MiniDFSCluster cluster = |
| new MiniDFSCluster(conf, REPLICATION_FACTOR, true, null); |
| try { |
| final FSNamesystem namesystem = cluster.getNamesystem(); |
| final FileSystem fs = cluster.getFileSystem(); |
| |
| // populate the cluster with a one block file |
| final Path FILE_PATH = new Path("/testfile"); |
| DFSTestUtil.createFile(fs, FILE_PATH, 1L, REPLICATION_FACTOR, 1L); |
| DFSTestUtil.waitReplication(fs, FILE_PATH, REPLICATION_FACTOR); |
| Block block = DFSTestUtil.getFirstBlock(fs, FILE_PATH); |
| |
| // keep a copy of all datanode descriptor |
| DatanodeDescriptor[] datanodes = |
| namesystem.heartbeats.toArray(new DatanodeDescriptor[REPLICATION_FACTOR]); |
| |
| // start two new nodes |
| cluster.startDataNodes(conf, 2, true, null, null); |
| cluster.waitActive(); |
| |
| // bring down first datanode |
| DatanodeDescriptor datanode = datanodes[0]; |
| DataNodeProperties dnprop = cluster.stopDataNode(datanode.getName()); |
| // make sure that NN detects that the datanode is down |
| synchronized (namesystem.heartbeats) { |
| datanode.setLastUpdate(0); // mark it dead |
| namesystem.heartbeatCheck(); |
| } |
| // the block will be replicated |
| DFSTestUtil.waitReplication(fs, FILE_PATH, REPLICATION_FACTOR); |
| |
| // restart the first datanode |
| cluster.restartDataNode(dnprop); |
| cluster.waitActive(); |
| |
| // check if excessive replica is detected |
| NumberReplicas num = null; |
| do { |
| synchronized (namesystem) { |
| num = namesystem.blockManager.countNodes(block); |
| } |
| } while (num.excessReplicas() == 0); |
| |
| // find out a non-excess node |
| Iterator<DatanodeDescriptor> iter = namesystem.blockManager.blocksMap.nodeIterator(block); |
| DatanodeDescriptor nonExcessDN = null; |
| while (iter.hasNext()) { |
| DatanodeDescriptor dn = iter.next(); |
| Collection<Block> blocks = namesystem.blockManager.excessReplicateMap.get(dn.getStorageID()); |
| if (blocks == null || !blocks.contains(block) ) { |
| nonExcessDN = dn; |
| break; |
| } |
| } |
| assertTrue(nonExcessDN!=null); |
| |
| // bring down non excessive datanode |
| dnprop = cluster.stopDataNode(nonExcessDN.getName()); |
| // make sure that NN detects that the datanode is down |
| synchronized (namesystem.heartbeats) { |
| nonExcessDN.setLastUpdate(0); // mark it dead |
| namesystem.heartbeatCheck(); |
| } |
| |
| // The block should be replicated |
| do { |
| num = namesystem.blockManager.countNodes(block); |
| } while (num.liveReplicas() != REPLICATION_FACTOR); |
| |
| // restart the first datanode |
| cluster.restartDataNode(dnprop); |
| cluster.waitActive(); |
| |
| // check if excessive replica is detected |
| do { |
| num = namesystem.blockManager.countNodes(block); |
| } while (num.excessReplicas() != 2); |
| } finally { |
| cluster.shutdown(); |
| } |
| } |
| } |