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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2011/02/01 00:23:29 UTC

[jira] Commented: (HBASE-3455) Heap fragmentation in region server

    [ https://issues.apache.org/jira/browse/HBASE-3455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12988955#comment-12988955 ] 

stack commented on HBASE-3455:
------------------------------

+1 on commit to branch and trunk (fix licenses on commit).  I think its important that this stuff get an airing as soon as possible (and its off by default).

> 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
>    Affects Versions: 0.90.1
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>             Fix For: 0.90.1
>
>         Attachments: HBasefragmentation.pdf, collapse-arrays.patch, icv-frag.png, mslab-1.txt, mslab-2.txt, mslab-3.txt, mslab-4.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 solutions.

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