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https://issues.apache.org/jira/browse/HBASE-3455?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HBASE-3455:
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Attachment: mslab-5.txt
New version fixes ICV.
I ran this one through the full test suite with MSLAB enabled, and it passed.
(my previous test run had been with mslab disabled so it didn't show that ICV
was massively broken!)
Also includes a test case that triggers the pathological behavior.
> 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, 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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