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https://issues.apache.org/jira/browse/HBASE-3455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12988289#action_12988289
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Jonathan Gray commented on HBASE-3455:
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I'm cool with 0.90.1 because it would be good to get this out there for people
to experiment with sooner than later (and it's off by default, which I think it
needs to be until we do more experimenting with more workloads in more
environments). Seems like there's a lot of configuration params that could go
into this too that may need tweaking in general and in different setups?
> 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: 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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