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From "Zhihong Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4970) Add a parameter so that keepAliveTime of Htable thread pool can be changed
Date Mon, 19 Dec 2011 06:52:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13172053#comment-13172053
] 

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

I think the likelihood of 0.90.5 RC going through is high.
So we should add 0.90.6 section to CHANGES.txt of 0.92 and TRUNK.
                
> Add a parameter so that keepAliveTime of Htable thread pool can be changed
> --------------------------------------------------------------------------
>
>                 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,
HBASE-4970_Branch92_V2.patch, HBASE-4970_Trunk_V2.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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