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https://issues.apache.org/jira/browse/HBASE-3455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12984562#action_12984562
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Tatsuya Kawano commented on HBASE-3455:
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Hi Todd. Thanks for your comment. I'm looking forwared to seeing the next
report!
So, you're going to debug G1GC itself? Wow, you're the memory guy. G1GC sounds
promissing and I wonder why it doesn't work well for us. Maybe, KeyValues from
different memstores are mixed up in all over the place so it can't release any
region?
> 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: HBasefragmentation.pdf, parse-fls-statistics.py
>
>
> 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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