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https://issues.apache.org/jira/browse/HBASE-9987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13825238#comment-13825238
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Nicolas Liochon commented on HBASE-9987:
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In v2 I've put back the cachedServer. We could do better than this, but short
term it's safer to keep it. That's the only difference, so I will commit if the
unit tests pass.
> 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, 9987.v2.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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