Eli Collins created HDFS-4030:
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Summary: BlockManager excessBlocksCount and
postponedMisreplicatedBlocksCount should be AtomicLongs
Key: HDFS-4030
URL: https://issues.apache.org/jira/browse/HDFS-4030
Project: Hadoop HDFS
Issue Type: Sub-task
Components: name-node
Affects Versions: 2.0.0-alpha
Reporter: Eli Collins
Assignee: Eli Collins
The BlockManager excessBlocksCount and postponedMisreplicatedBlocksCount fields
are currently volatile longs which are incremented, which isn't thread safe. It
looks like they're always incremented on paths that hold the NN write lock but
it would be easier and less error prone for future changes if we made them
AtomicLongs. The other volatile long members are just set in one thread and
read in another so they're fine as is.
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