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https://issues.apache.org/jira/browse/HBASE-9399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13850147#comment-13850147
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Lars Hofhansl commented on HBASE-9399:
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More discussion here: HBASE-5311 :)
> 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
> Fix For: 0.98.0
>
>
> 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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