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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-3.txt
Oops, missed one test change before.
This patch should be good to go. I tested under heavy load (95% write, 5%
increment, large working set to trigger block cache churn) on a cluster for
about 16 hours, no full GCs at all in 8G heap with CMS.
But it's still off by default because of the worrisome theoretical
possibilities with upsert.
> 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, mslab-2.txt, mslab-3.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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