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From "Nicolas Liochon (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-11209) Increase the default value for hbase.hregion.memstore.block.multipler from 2 to 4
Date Fri, 23 May 2014 17:47:01 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11209?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nicolas Liochon resolved HBASE-11209.
-------------------------------------

      Resolution: Fixed
    Hadoop Flags: Reviewed

Committed to master & 0.98, hopefully correctly with the new git based process.

Thanks for the review, Andrew!

> Increase the default value for hbase.hregion.memstore.block.multipler from 2 to 4
> ---------------------------------------------------------------------------------
>
>                 Key: HBASE-11209
>                 URL: https://issues.apache.org/jira/browse/HBASE-11209
>             Project: HBase
>          Issue Type: Brainstorming
>          Components: regionserver
>    Affects Versions: 0.99.0, 0.98.2
>            Reporter: Nicolas Liochon
>            Assignee: Nicolas Liochon
>             Fix For: 0.99.0, 0.98.3
>
>         Attachments: HBASE-11209.patch
>
>
> On a YCSB test, I saw a 33% performance increase, both on the max latency and on the
throughput. I'm convinced enough that this value is better that I think it makes sense to
change it on 0.98 as well.
> More fundamentally, but outside of the scope of this patch, I think this parameter should
be changed to something at the region server level: today, we have:
> - global memstore check: if we're other 40%, we flush the biggest memstore
> - local: no more than 2 (proposed: 4) memstore size per region.
> But if we have enough memory and a spike on a region, there is no reason for not taking
the write.



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