/**
* 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.io.File;
import java.io.IOException;
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.TestDatanodeBlockScanner;
import org.apache.hadoop.hdfs.MiniDFSCluster.DataNodeProperties;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.DatanodeID;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import junit.framework.TestCase;
public class TestOverReplicatedBlocks extends TestCase {
/** Test processOverReplicatedBlock can handle corrupt replicas fine.
* It make sure that it won't treat corrupt replicas as valid ones
* thus prevents NN deleting valid replicas but keeping
* corrupt ones.
*/
public void testProcesOverReplicateBlock() throws IOException {
Configuration conf = new HdfsConfiguration();
conf.setLong("dfs.blockreport.intervalMsec", 1000L);
conf.set(DFSConfigKeys.DFS_NAMENODE_REPLICATION_PENDING_TIMEOUT_SEC_KEY, Integer.toString(2));
MiniDFSCluster cluster = new MiniDFSCluster(conf, 3, true, null);
FileSystem fs = cluster.getFileSystem();
try {
final Path fileName = new Path("/foo1");
DFSTestUtil.createFile(fs, fileName, 2, (short)3, 0L);
DFSTestUtil.waitReplication(fs, fileName, (short)3);
// corrupt the block on datanode 0
Block block = DFSTestUtil.getFirstBlock(fs, fileName);
TestDatanodeBlockScanner.corruptReplica(block.getBlockName(), 0);
DataNodeProperties dnProps = cluster.stopDataNode(0);
// remove block scanner log to trigger block scanning
File scanLog = new File(System.getProperty("test.build.data"),
"dfs/data/data1" + MiniDFSCluster.FINALIZED_DIR_NAME +
"dncp_block_verification.log.curr");
//wait for one minute for deletion to succeed;
for(int i=0; !scanLog.delete(); i++) {
assertTrue("Could not delete log file in one minute", i < 60);
try {
Thread.sleep(1000);
} catch (InterruptedException ignored) {}
}
// restart the datanode so the corrupt replica will be detected
cluster.restartDataNode(dnProps);
DFSTestUtil.waitReplication(fs, fileName, (short)2);
final DatanodeID corruptDataNode =
cluster.getDataNodes().get(2).dnRegistration;
final FSNamesystem namesystem = cluster.getNamesystem();
synchronized (namesystem.heartbeats) {
// set live datanode's remaining space to be 0
// so they will be chosen to be deleted when over-replication occurs
for (DatanodeDescriptor datanode : namesystem.heartbeats) {
if (!corruptDataNode.equals(datanode)) {
datanode.updateHeartbeat(100L, 100L, 0L, 0);
}
}
// decrease the replication factor to 1;
namesystem.setReplication(fileName.toString(), (short)1);
// corrupt one won't be chosen to be excess one
// without 4910 the number of live replicas would be 0: block gets lost
assertEquals(1, namesystem.blockManager.countNodes(block).liveReplicas());
}
} finally {
cluster.shutdown();
}
}
}