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https://issues.apache.org/jira/browse/HBASE-9987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13824967#comment-13824967
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Lars Hofhansl commented on HBASE-9987:
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+1
Will add the ConcurrentMap stuff to 0.94 as well.
> Remove some synchronisation points in HConnectionManager
> --------------------------------------------------------
>
> Key: HBASE-9987
> URL: https://issues.apache.org/jira/browse/HBASE-9987
> Project: HBase
> Issue Type: Bug
> Components: Client
> Affects Versions: 0.98.0, 0.96.0
> Reporter: Nicolas Liochon
> Assignee: Nicolas Liochon
> Fix For: 0.98.0, 0.96.1
>
> Attachments: 9987.v1.patch
>
>
> Change a Map to a concurrentMap
> Removed the "cachedServer (introduced in HBASE-4785). I suspect that this
> function is not needed anymore as we also have a list of dead servers, and
> accessing the list is not blocking. I will dig into this more however.
> The patch gives a 10% improvement with the NoClusterClient.
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