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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-3411) manually compact memstores?
Date Tue, 04 Jan 2011 19:45:49 GMT

     [ https://issues.apache.org/jira/browse/HBASE-3411?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HBASE-3411:
-------------------------------

    Attachment: hbase-3411.txt

Here it is in all its buggy glory

> 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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