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Posted to dev@hbase.apache.org by "Vladimir Rodionov (JIRA)" <ji...@apache.org> on 2016/03/23 00:38:25 UTC

[jira] [Resolved] (HBASE-15513) hbase.hregion.memstore.chunkpool.maxsize is 0.0 by default

     [ https://issues.apache.org/jira/browse/HBASE-15513?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Rodionov resolved HBASE-15513.
---------------------------------------
    Resolution: Information Provided

MemSLAB chunk pool must be enabled, at least in CMS. There are some debates whether it should be enabled in G1GC or not.

Recommendation:
Set *hbase.hregion.memstore.chunkpool.maxsize* to memstore default size (0.4f)


> 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: Improvement
>    Affects Versions: 2.0.0
>            Reporter: Vladimir Rodionov
>            Assignee: Vladimir Rodionov
>             Fix For: 2.0.0
>
>
> 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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