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HDFS-4075. Reduce recommissioning overhead (Kihwal Lee via daryn) 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1406278 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Daryn Sharp 2012-11-06 19:27:47 +00:00
parent b68bd472dc
commit 54b70db347
3 changed files with 11 additions and 1 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -1940,6 +1940,8 @@ Release 0.23.5 - UNRELEASED
OPTIMIZATIONS
HDFS-4075. Reduce recommissioning overhead (Kihwal Lee via daryn)
BUG FIXES
HDFS-3829. TestHftpURLTimeouts fails intermittently with JDK7 (Trevor

4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
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@ -2696,6 +2696,7 @@ assert storedBlock.findDatanode(dn) < 0 : "Block " + block
void processOverReplicatedBlocksOnReCommission(
final DatanodeDescriptor srcNode) {
final Iterator<? extends Block> it = srcNode.getBlockIterator();
int numOverReplicated = 0;
while(it.hasNext()) {
final Block block = it.next();
BlockCollection bc = blocksMap.getBlockCollection(block);
@ -2705,8 +2706,11 @@ assert storedBlock.findDatanode(dn) < 0 : "Block " + block
if (numCurrentReplica > expectedReplication) {
// over-replicated block
processOverReplicatedBlock(block, expectedReplication, null, null);
numOverReplicated++;
}
}
LOG.info("Invalidated " + numOverReplicated + " over-replicated blocks on " +
srcNode + " during recommissioning");
}
/**

4
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java
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@ -608,9 +608,13 @@ public class DatanodeManager {
if (node.isDecommissionInProgress() || node.isDecommissioned()) {
LOG.info("Stop Decommissioning " + node);
heartbeatManager.stopDecommission(node);
// Over-replicated blocks will be detected and processed when
// the dead node comes back and send in its full block report.
if (node.isAlive) {
blockManager.processOverReplicatedBlocksOnReCommission(node);
}
}
}
/**
* Generate new storage ID.