Xi Fang created HADOOP-9714:
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Summary: Branch-1-win TestReplicationPolicy failed caused by stale
data node handling
Key: HADOOP-9714
URL: https://issues.apache.org/jira/browse/HADOOP-9714
Project: Hadoop Common
Issue Type: Bug
Affects Versions: 1-win
Reporter: Xi Fang
Assignee: Xi Fang
Fix For: 1-win
Condor-Branch-1 TestReplicationPolicy failed on
* testChooseTargetWithMoreThanAvailableNodes()
* testChooseTargetWithStaleNodes()
* testChooseTargetWithHalfStaleNodes()
The root of cause of testChooseTargetWithMoreThanAvailableNodes failing is the
following:
In BlockPlacementPolicyDefault#chooseTarget()
{code}
chooseRandom(numOfReplicas, NodeBase.ROOT, excludedNodes,
blocksize, maxNodesPerRack, results);
} catch (NotEnoughReplicasException e) {
FSNamesystem.LOG.warn("Not able to place enough replicas, still in need
of " + numOfReplicas);
{code}
However, numOfReplicas is passed into chooseRandom() as int (primitive type in
java) by value. The updating operation for numOfReplicas in chooseRandom() will
not change the value in chooseTarget().
The root cause for testChooseTargetWithStaleNodes() and
testChooseTargetWithHalfStaleNodes() is the current
BlockPlacementPolicyDefault#chooseTarget() doesn't check if a node is stale.
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