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HDFS-3119. Overreplicated block is not deleted even after the replication factor is reduced after sync follwed by closing that file. Contributed by Ashish Singhi. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1311391 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Uma Maheswara Rao G 2012-04-09 19:28:32 +00:00
parent 8d6142756c
commit 75f105d0b4
4 changed files with 44 additions and 5 deletions
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4
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -339,6 +339,10 @@ Release 2.0.0 - UNRELEASED
HDFS-3214. InterDatanodeProtocolServerSideTranslatorPB doesn't handle
null response from initReplicaRecovery (todd)
HDFS-3119. Overreplicated block is not deleted even after the replication
factor is reduced after sync follwed by closing that file. (Ashish Singhi
via umamahesh)
BREAKDOWN OF HDFS-1623 SUBTASKS
HDFS-2179. Add fencing framework and mechanisms for NameNode HA. (todd)

6
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
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@ -2769,7 +2769,7 @@ assert storedBlock.findDatanode(dn) < 0 : "Block " + block
}
}
public void checkReplication(Block block, int numExpectedReplicas) {
public void checkReplication(Block block, short numExpectedReplicas) {
// filter out containingNodes that are marked for decommission.
NumberReplicas number = countNodes(block);
if (isNeededReplication(block, numExpectedReplicas, number.liveReplicas())) {
@ -2777,6 +2777,10 @@ assert storedBlock.findDatanode(dn) < 0 : "Block " + block
number.liveReplicas(),
number.decommissionedReplicas(),
numExpectedReplicas);
return;
}
if (number.liveReplicas() > numExpectedReplicas) {
processOverReplicatedBlock(block, numExpectedReplicas, null, null);
}
}

6
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -2120,10 +2120,12 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
/**
* Check all blocks of a file. If any blocks are lower than their intended
* replication factor, then insert them into neededReplication
* replication factor, then insert them into neededReplication and if
* the blocks are more than the intended replication factor then insert
* them into invalidateBlocks.
*/
private void checkReplicationFactor(INodeFile file) {
int numExpectedReplicas = file.getReplication();
short numExpectedReplicas = file.getReplication();
Block[] pendingBlocks = file.getBlocks();
int nrBlocks = pendingBlocks.length;
for (int i = 0; i < nrBlocks; i++) {

33
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestOverReplicatedBlocks.java
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@ -17,12 +17,13 @@
*/
package org.apache.hadoop.hdfs.server.blockmanagement;
import static org.junit.Assert.*;
import java.io.File;
import java.io.IOException;
import junit.framework.TestCase;
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;
@ -36,13 +37,15 @@ 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 extends TestCase {
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);
@ -113,4 +116,30 @@ public class TestOverReplicatedBlocks extends TestCase {
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();
}
}
}