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From "Zhihong Yu (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 17:58:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13164580#comment-13164580
] 

Zhihong Yu commented on HBASE-4970:
-----------------------------------

Patch v2 is a backport and doesn't change keepAliveTime.
I feel we should address the needs of HTable users.

I am fine with the backport - we may want to modify the title of this JIRA accordingly.
                
> 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
>
>         Attachments: HBASE-4970_Branch90.patch, HBASE-4970_Branch90_V1_trial.patch
>
>
> In my cluster, I changed keepAliveTime from 60 s to 3600 s.  Increasing RES is slowed
down.
> 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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