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From "gaojinchao (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4970) Add a parameter to change keepAliveTime of Htable thread pool.
Date Wed, 07 Dec 2011 04:27:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13164127#comment-13164127

gaojinchao commented on HBASE-4970:

ok, No problem. 
> Add a parameter  to change keepAliveTime of Htable thread pool.
> ---------------------------------------------------------------
>                 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: 0.90.5
> 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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