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https://issues.apache.org/jira/browse/HBASE-3483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12988984#comment-12988984
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Jonathan Gray commented on HBASE-3483:
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This is a pretty ugly bug, I say branch and trunk.
> No soft flush trigger on global memstore limit
> ----------------------------------------------
>
> Key: HBASE-3483
> URL: https://issues.apache.org/jira/browse/HBASE-3483
> Project: HBase
> Issue Type: Bug
> Components: performance, regionserver
> Affects Versions: 0.90.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Fix For: 0.90.1
>
> Attachments: hbase-3483.txt, hbase-3483.txt
>
>
> I think this is the reason people see long blocking periods under write load.
> Currently when we hit the global memstore limit, we call
> reclaimMemStoreMemory() which is synchronized - thus everyone has to wait
> until the memory has flushed down to the low water mark. This causes every
> writer to block for 10-15 seconds on a large heap.
> Instead we should start triggering flushes (in another thread) whenever we're
> above the low water mark. Then only block writers when we're above the high
> water mark.
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