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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: parse-fls-statistics.py
Here's the python script I use to convert the FLS statistics log into a TSV
format for graphing.
I was using the following flags with JVM 6u23:
-XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintTenuringDistribution
-verbose:gc -Xloggc:$HBASE_HOME/logs/gc-$(hostname)-hbase.log
-XX:PrintCMSStatistics=1 -XX:PrintFLSStatistics=1
Might need to fiddle with the regex in the script if you use different flags or
a different JVM release.
> 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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