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From "Vladimir Rodionov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15542) Minimize garbage memory allocations during compaction
Date Sat, 26 Mar 2016 22:04:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15213219#comment-15213219
] 

Vladimir Rodionov commented on HBASE-15542:
-------------------------------------------

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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