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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15513) hbase.hregion.memstore.chunkpool.maxsize is 0.0 by default
Date Thu, 01 Sep 2016 07:30:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15454613#comment-15454613

Anoop Sam John commented on HBASE-15513:

Ya at least the tests what we did using CMS and G1 shows that chunk pool still have value.
With G1GC and with out chunk pool, we were able to get latency and GC pause same as with pool
case BUT with much more heap size allocated for the RS.   So said that, the chunk pool was
helping us to achieve what we wanted with lower heap size.    Also to mention that here we
set global memstore upper limit as 43% only as we wanted to keep the IHOP for G1GC as some
thing like 50% max.

> hbase.hregion.memstore.chunkpool.maxsize is 0.0 by default
> ----------------------------------------------------------
>                 Key: HBASE-15513
>                 URL: https://issues.apache.org/jira/browse/HBASE-15513
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 2.0.0
>            Reporter: Vladimir Rodionov
>            Assignee: Vladimir Rodionov
>             Fix For: 2.0.0
>         Attachments: HBASE-15513-v1.patch
> That results in excessive MemStoreLAB chunk allocations because we can not reuse them.
Not sure, why it has been disabled, by default. May be the code has not been tested well?

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