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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-3455) Heap fragmentation in region server
Date Tue, 25 Jan 2011 15:02:45 GMT

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

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

    Attachment: with-kvallocs.png

Hey cool, looks like it worked. None of my regionservers had any full GCs. Max chunk size
is still around 700MB after the YCSB load, and I think total throughput actually went up as
well. 

> 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, 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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