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https://issues.apache.org/jira/browse/HDFS-11540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15933595#comment-15933595
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Ravi Prakash commented on HDFS-11540:
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Thanks for your contribution Ravikumar! :-)
Could you please elaborate more on what prompted you to optimize this code?
Were you seeing this bottleneck in your cluster perhaps? Under what
circumstances?
> PeerCache sync overhead
> -----------------------
>
> Key: HDFS-11540
> URL: https://issues.apache.org/jira/browse/HDFS-11540
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client
> Affects Versions: 2.7.1
> Reporter: Ravikumar
> Priority: Minor
> Attachments: PeerCache.diff
>
>
> PeerCache has a fair amount sync over-head. In addition to class level
> locking, expired sockets & eldest socket are closed in critical section
> during gets & puts respectively..
> A ConcurrentLinkedHashMap with appropriate fencing using DatanodeID could
> speed it up?
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