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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2014/05/20 17:30:39 UTC
[jira] [Commented] (HBASE-11209) Increase the default value for
hbase.hregion.memstore.block.multipler from 2 to 4
[ https://issues.apache.org/jira/browse/HBASE-11209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14003443#comment-14003443 ]
stack commented on HBASE-11209:
-------------------------------
+1
> 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
>
>
> 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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