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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-3455) Heap fragmentation in region server
Date Mon, 07 Feb 2011 21:41:57 GMT

     [ https://issues.apache.org/jira/browse/HBASE-3455?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HBASE-3455:
-------------------------------

      Resolution: Fixed
    Release Note: Adds an allocation buffer local to each memstore which is used to combat
heap fragmentation. Experimental in 0.90.1 - enable by toggling hbase.hregion.memstore.mslab.enabled.
Enabled by default in 0.91
    Hadoop Flags: [Reviewed]
          Status: Resolved  (was: Patch Available)

> 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, mslab-5.txt, mslab-6.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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