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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 Mon, 07 Nov 2016 17:46:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15644842#comment-15644842
] 

Anoop Sam John commented on HBASE-15513:
----------------------------------------

I mean , now we make MSLAB pool ON by default and 100% memstore size is the max size.  So
if there are writes we will keep adding MSLAB chunks to pool. This will be permanent in the
pool. Later when there are not many writes also we will occupy 40% of the memory with SLAB
chunks (def value am taking)..  The Heap tuner, if ON, will tune the memstore size down and
that will even do release of some of the unwanted chunks.  THat is why I was saying we need
to turn heap tuner also ON by def now.  There is a jira for that already. Make sense?

> 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-addendum.patch, 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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