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Posted to hdfs-dev@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2011/08/24 19:52:30 UTC

[jira] [Created] (HDFS-2283) Already pending replication targets are incorrectly chosen for another replication of the same block

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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