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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: collapse-arrays.patch
here's a fairly simple patch that adds a moderately efficient (read: CAS-happy)
allocation arena per memstore. When a KV gets added to the memstore it clones
its byte array into the arena. Hopefully this means that when the memstore gets
freed, it will be able to release large chunks of heap.
> 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,
> 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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