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From "gaojinchao (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4970) Allow better control of resource consumption in HTable (backport HBASE-4805 to 0.90 branch)
Date Tue, 13 Dec 2011 11:49:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13168310#comment-13168310

gaojinchao commented on HBASE-4970:

Thanks for your comments
My consideration:
1. For original users, Only change the configure and don't need manage so many resources.
2. For the new users, They can manage the ExecutorService and HConnection by themselves if
they need.

I will make a patch for Trunk and 0.92. :)

> Allow better control of resource consumption in HTable (backport HBASE-4805 to 0.90 branch)
> -------------------------------------------------------------------------------------------
>                 Key: HBASE-4970
>                 URL: https://issues.apache.org/jira/browse/HBASE-4970
>             Project: HBase
>          Issue Type: Improvement
>          Components: client
>    Affects Versions: 0.90.4
>            Reporter: gaojinchao
>            Assignee: gaojinchao
>            Priority: Trivial
>             Fix For: 0.90.6
>         Attachments: HBASE-4970_Branch90.patch, HBASE-4970_Branch90_V1_trial.patch, HBASE-4970_Branch90_V2.patch
> In my cluster, I changed keepAliveTime from 60 s to 3600 s.  Increasing RES is slowed
> Why increasing keepAliveTime of HBase thread pool is slowing down our problem occurance
[RES value increase]?
> You can go through the source of sun.nio.ch.Util. Every thread hold 3 softreference of
direct buffer(mustangsrc) for reusage. The code names the 3 softreferences buffercache. If
the buffer was all occupied or none was suitable in size, and new request comes, new direct
buffer is allocated. After the service, the bigger one replaces the smaller one in buffercache.
The replaced buffer is released.
> So I think we can add a parameter to change keepAliveTime of Htable thread pool.

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