[jira] [Commented] (HBASE-9399) Up the memstore flush size

["Elliott Clark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-9399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13755221#comment-13755221 ] 

Elliott Clark commented on HBASE-9399:
--------------------------------------

My test cluster is pretty slammed right now with testing 0.96.  I'll try and get some perf numbers sometime next week.
                
> Up the memstore flush size
> --------------------------
>
>                 Key: HBASE-9399
>                 URL: https://issues.apache.org/jira/browse/HBASE-9399
>             Project: HBase
>          Issue Type: Task
>          Components: regionserver
>    Affects Versions: 0.98.0, 0.96.0
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>
> As heap sizes get bigger we are still recommending that users keep their number of regions to a minimum.  This leads to lots of un-used memstore memory.
> For example I have a region server with 48 gigs of ram.  30 gigs are there for the region server.  This with current defaults the global memstore size reserved is 8 gigs.
> The per region memstore size is 128mb right now.  That means that I need 80 regions actively taking writes to reach the global memstore size.  That number is way out of line with what our split policies currently give users.  They are given much fewer regions by default.
> We should up the hbase.hregion.memstore.flush.size size.  Ideally we should auto tune everything.  But until then I think something like 512mb would help a lot with our write throughput on clusters that don't have several hundred regions per RS.

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