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https://issues.apache.org/jira/browse/HBASE-3411?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon resolved HBASE-3411.
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Resolution: Won't Fix
This seems to have been obviated by MSLAB in later 0.90, 0.92+
> manually compact memstores?
> ---------------------------
>
> Key: HBASE-3411
> URL: https://issues.apache.org/jira/browse/HBASE-3411
> Project: HBase
> Issue Type: Brainstorming
> Components: regionserver
> Reporter: Todd Lipcon
> Attachments: hbase-3411.txt
>
>
> I have a theory and some experiments that indicate our heap fragmentation
> issues has to do with the KV buffers from memstores ending up entirely
> interleaved in the old gen. I had a bit of wine and came up with a wacky idea
> to have a thread which continuously defragments memstore data buffers into
> contiguous segments, hopefully to keep old gen fragmentation down.
> It didn't seem to work just yet, but wanted to show the patch to some people.
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