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https://issues.apache.org/jira/browse/HBASE-11590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14804478#comment-14804478
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stack commented on HBASE-11590:
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bq. If we cut down the timeout, it's more or less equivalent of not having a
thread pool at all.
Well, if a timeout of 1 or 10 seconds, the pool would be in place when we need
it... in times of read/write.
No hurry [~nkeywal] On the create of one thread too many, I'd not be too
worried given we seem to currently create 255 threads too many (smile).
> use a specific ThreadPoolExecutor
> ---------------------------------
>
> Key: HBASE-11590
> URL: https://issues.apache.org/jira/browse/HBASE-11590
> Project: HBase
> Issue Type: Bug
> Components: Client, Performance
> Affects Versions: 1.0.0, 2.0.0
> Reporter: Nicolas Liochon
> Assignee: Nicolas Liochon
> Priority: Minor
> Fix For: 2.0.0
>
> Attachments: tp.patch
>
>
> The JDK TPE creates all the threads in the pool. As a consequence, we create
> (by default) 256 threads even if we just need a few.
> The attached TPE create threads only if we have something in the queue.
> On a PE test with replica on, it improved the 99 latency percentile by 5%.
> Warning: there are likely some race conditions, but I'm posting it here
> because there is may be an implementation available somewhere we can use, or
> a good reason not to do that. So feedback welcome as usual.
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