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https://issues.apache.org/jira/browse/HBASE-9869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13824618#comment-13824618
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Nicolas Liochon commented on HBASE-9869:
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I've tested v4 with 100K regions, on a scenario with random writes (and a
different computer than the previous tests: the results are not directly
comparable).
||#clients|#puts|time without the patch|time with the patch||
||2 clients| 50 million each| 114 seconds|72 seconds||
So there is a 65% gap between the two versions.
> Optimize HConnectionManager#getCachedLocation
> ---------------------------------------------
>
> Key: HBASE-9869
> URL: https://issues.apache.org/jira/browse/HBASE-9869
> 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: 6869.v4.patch, 9869.v1.patch, 9869.v1.patch,
> 9869.v2.patch
>
>
> It javadoc says: "TODO: This method during writing consumes 15% of CPU doing
> lookup". This is still true, says Yourkit. With 0.96, we also spend more time
> in these methods. We retry more, and the AsyncProcess calls it in parallel.
> I don't have the patch for this yet, but I will spend some time on it.
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