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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