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https://issues.apache.org/jira/browse/HBASE-4970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13164276#comment-13164276
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gaojinchao commented on HBASE-4970:
-----------------------------------
Sorry, I didn't see the Lars's comment. I will try to backport HBASE-4805.
> 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
>
>
> 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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