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From "Tatsuya Kawano (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3455) Heap fragmentation in region server
Date Wed, 26 Jan 2011 06:45:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12986864#action_12986864

Tatsuya Kawano commented on HBASE-3455:

Just realized ICV means fixed-size KeyValue, right? These old and new KeyValues must have
the exactly same key (except fixed-size timestamp) with a fixed-size value (Long value). Maybe
we can just override the old value on the slab with the new value?

> Heap fragmentation in region server
> -----------------------------------
>                 Key: HBASE-3455
>                 URL: https://issues.apache.org/jira/browse/HBASE-3455
>             Project: HBase
>          Issue Type: Brainstorming
>          Components: performance, regionserver
>            Reporter: Todd Lipcon
>            Priority: Critical
>         Attachments: collapse-arrays.patch, HBasefragmentation.pdf, icv-frag.png, mslab-1.txt,
parse-fls-statistics.py, with-kvallocs.png
> Stop-the-world GC pauses have long been a problem in HBase. "Concurrent mode failures"
can usually be tuned around by setting the initiating occupancy fraction low, but eventually
the heap becomes fragmented and a promotion failure occurs.
> This JIRA is to do research/experiments about the heap fragmentation issue and possible

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