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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2283) Already pending replication targets are incorrectly chosen for another replication of the same block
Date Wed, 24 Aug 2011 17:52:30 GMT
Already pending replication targets are incorrectly chosen for another replication of the same
block
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                 Key: HDFS-2283
                 URL: https://issues.apache.org/jira/browse/HDFS-2283
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: name-node
    Affects Versions: 0.23.0
            Reporter: Todd Lipcon


In looking at tests for HDFS-1172, I came across this issue: we currently only track the _number_
of pending replications per block, but not the targets themselves. Thus, if the replication
count of a block is raised while replicas are already pending, the second set of replication
targets may overlap with the first. This causes a ReplicaAlreadyExistsException for the second
replication attempt, and the block is left under-replicated until the pending replication
times out.

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