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https://issues.apache.org/jira/browse/HDFS-12479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16169758#comment-16169758
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Huafeng Wang commented on HDFS-12479:
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# In {{MultipleBlockingQueue}}, the underlying list is immutable so there will
be no concurrent modification and lock here is not needed.
# In {{Coordinator}}, {{ConcurrentHashMap}} will have better performance than
{{Collections.synchronizedMap}}.
> Some misuses of lock in DFSStripedOutputStream
> ----------------------------------------------
>
> Key: HDFS-12479
> URL: https://issues.apache.org/jira/browse/HDFS-12479
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Huafeng Wang
> Assignee: Huafeng Wang
> Priority: Minor
>
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