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https://issues.apache.org/jira/browse/HBASE-4970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13172050#comment-13172050
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Lars Hofhansl commented on HBASE-4970:
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About to commit. What do we do with the CHANGES.txt file now. This is a 0.90
change, so I want to add it to the 0.90 section in trunk and 0.92 as well. They
still have 0.90.5 marked as unreleased.
In 0.90 there is a 0.90.6 entry also marked as unreleased (in addition to
0.90.5, which is also marked as unreleased). Should I add a 0.90.6 row in 0.92
in 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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