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From "Nicolas Liochon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10449) Wrong execution pool configuration in HConnectionManager
Date Wed, 16 Sep 2015 05:44:46 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14746919#comment-14746919
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Nicolas Liochon commented on HBASE-10449:
-----------------------------------------

Actually I'm having two doubts:
- the core threads should already have this timeout, no. We should not see 256 threads, because
they should expire already
- IIRC, this thread pool is used when connecting to the various regionserver, and they block
until they have an answer. So with 4 core threads (for example), it means that if we do a
multi we contact 4 servers simultaneously at most. The threads are not really using CPUs,
they're waiting  (old i/o style). BUt may be it has changed?





> Wrong execution pool configuration in HConnectionManager
> --------------------------------------------------------
>
>                 Key: HBASE-10449
>                 URL: https://issues.apache.org/jira/browse/HBASE-10449
>             Project: HBase
>          Issue Type: Bug
>          Components: Client
>    Affects Versions: 0.98.0, 0.99.0, 0.96.1.1
>            Reporter: Nicolas Liochon
>            Assignee: Nicolas Liochon
>            Priority: Critical
>             Fix For: 0.98.0, 0.96.2, 0.99.0
>
>         Attachments: HBASE-10449.v1.patch
>
>
> There is a confusion in the configuration of the pool. The attached patch fixes this.
This may change the client performances, as we were using a single thread.



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