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https://issues.apache.org/jira/browse/HBASE-15542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15213219#comment-15213219
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Vladimir Rodionov commented on HBASE-15542:
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28% of memory allocation is due to HBASE-15509.
> Minimize garbage memory allocations during compaction
> -----------------------------------------------------
>
> Key: HBASE-15542
> URL: https://issues.apache.org/jira/browse/HBASE-15542
> Project: HBase
> Issue Type: Improvement
> Components: Compaction
> Affects Versions: 2.0.0
> Reporter: Vladimir Rodionov
> Assignee: Vladimir Rodionov
> Fix For: 2.0.0
>
>
> Compactions are CPU-bound, not I/O bound. We can mitigate this by increasing
> number of compaction threads for small and large compactions, but excessive
> object allocation limits maximum number of compaction threads we can use w/o
> bringing down RS due to very frequent GC cycles.
>
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