/**
* 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.*;
import java.io.File;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
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.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.TestDatanodeBlockScanner;
import org.apache.hadoop.hdfs.protocol.DatanodeID;
import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
import org.apache.hadoop.hdfs.server.datanode.DataNodeTestUtils;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
import org.junit.Test;
public class TestOverReplicatedBlocks {
/** 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.
*/
@Test
public void testProcesOverReplicateBlock() throws IOException {
Configuration conf = new HdfsConfiguration();
conf.setLong(DFSConfigKeys.DFS_BLOCKREPORT_INTERVAL_MSEC_KEY, 1000L);
conf.set(
DFSConfigKeys.DFS_NAMENODE_REPLICATION_PENDING_TIMEOUT_SEC_KEY,
Integer.toString(2));
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(3).build();
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
ExtendedBlock block = DFSTestUtil.getFirstBlock(fs, fileName);
assertTrue(TestDatanodeBlockScanner.corruptReplica(block, 0));
DataNodeProperties dnProps = cluster.stopDataNode(0);
// remove block scanner log to trigger block scanning
File scanLog = new File(MiniDFSCluster.getFinalizedDir(
cluster.getInstanceStorageDir(0, 0),
cluster.getNamesystem().getBlockPoolId()).getParent().toString()
+ "/../dncp_block_verification.log.prev");
//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);
String blockPoolId = cluster.getNamesystem().getBlockPoolId();
final DatanodeID corruptDataNode =
DataNodeTestUtils.getDNRegistrationForBP(
cluster.getDataNodes().get(2), blockPoolId);
final FSNamesystem namesystem = cluster.getNamesystem();
final BlockManager bm = namesystem.getBlockManager();
final HeartbeatManager hm = bm.getDatanodeManager().getHeartbeatManager();
try {
namesystem.writeLock();
synchronized(hm) {
// set live datanode's remaining space to be 0
// so they will be chosen to be deleted when over-replication occurs
String corruptMachineName = corruptDataNode.getName();
for (DatanodeDescriptor datanode : hm.getDatanodes()) {
if (!corruptMachineName.equals(datanode.getName())) {
datanode.updateHeartbeat(100L, 100L, 0L, 100L, 0, 0);
}
}
// decrease the replication factor to 1;
NameNodeAdapter.setReplication(namesystem, 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, bm.countNodes(block.getLocalBlock()).liveReplicas());
}
} finally {
namesystem.writeUnlock();
}
} finally {
cluster.shutdown();
}
}
/**
* Test over replicated block should get invalidated when decreasing the
* replication for a partial block.
*/
@Test
public void testInvalidateOverReplicatedBlock() throws Exception {
Configuration conf = new HdfsConfiguration();
MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(3)
.build();
try {
final FSNamesystem namesystem = cluster.getNamesystem();
final BlockManager bm = namesystem.getBlockManager();
FileSystem fs = cluster.getFileSystem();
Path p = new Path(MiniDFSCluster.getBaseDirectory(), "/foo1");
FSDataOutputStream out = fs.create(p, (short) 2);
out.writeBytes("HDFS-3119: " + p);
out.hsync();
fs.setReplication(p, (short) 1);
out.close();
ExtendedBlock block = DFSTestUtil.getFirstBlock(fs, p);
assertEquals("Expected only one live replica for the block", 1, bm
.countNodes(block.getLocalBlock()).liveReplicas());
} finally {
cluster.shutdown();
}
}
}