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HDFS-4898. BlockPlacementPolicyWithNodeGroup.chooseRemoteRack() fails to properly fallback to local rack. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1514156 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Tsz-wo Sze 2013-08-15 04:52:52 +00:00
parent d0b61a169e
commit 0182ea16d3
2 changed files with 11 additions and 7 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -324,6 +324,9 @@ Release 2.1.1-beta - UNRELEASED
HDFS-5051. nn fails to download checkpointed image from snn in some
setups. (Vinay and suresh via suresh)
HDFS-4898. BlockPlacementPolicyWithNodeGroup.chooseRemoteRack() fails to
properly fallback to local rack. (szetszwo)
Release 2.1.0-beta - 2013-08-06
INCOMPATIBLE CHANGES

15
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyWithNodeGroup.java
View File

@ -169,16 +169,17 @@ public class BlockPlacementPolicyWithNodeGroup extends BlockPlacementPolicyDefau
long blocksize, int maxReplicasPerRack, List<DatanodeDescriptor> results,
boolean avoidStaleNodes) throws NotEnoughReplicasException {
int oldNumOfReplicas = results.size();
// randomly choose one node from remote racks
final String rackLocation = NetworkTopology.getFirstHalf(
localMachine.getNetworkLocation());
try {
chooseRandom(
numOfReplicas,
"~" + NetworkTopology.getFirstHalf(localMachine.getNetworkLocation()),
excludedNodes, blocksize, maxReplicasPerRack, results,
avoidStaleNodes);
// randomly choose from remote racks
chooseRandom(numOfReplicas, "~" + rackLocation, excludedNodes, blocksize,
maxReplicasPerRack, results, avoidStaleNodes);
} catch (NotEnoughReplicasException e) {
// fall back to the local rack
chooseRandom(numOfReplicas - (results.size() - oldNumOfReplicas),
localMachine.getNetworkLocation(), excludedNodes, blocksize,
rackLocation, excludedNodes, blocksize,
maxReplicasPerRack, results, avoidStaleNodes);
}
}