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From "Zhihong Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5056) [performance] On upload, 4% of memory allocations are NullInstance
Date Fri, 16 Dec 2011 19:56:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13171170#comment-13171170
] 

Zhihong Yu commented on HBASE-5056:
-----------------------------------

+1 on proposed change.
                
> [performance] On upload, 4% of memory allocations are NullInstance
> ------------------------------------------------------------------
>
>                 Key: HBASE-5056
>                 URL: https://issues.apache.org/jira/browse/HBASE-5056
>             Project: HBase
>          Issue Type: Improvement
>          Components: performance
>            Reporter: stack
>              Labels: noob
>         Attachments: NullInstanceHotSpotMemAllocation.html
>
>
> Profiling a PE upload, I see that 4% of memory allocations are instances of NullInstance
(caveat profiler's give distorted view of running app as does PE when it comes to real-world
workloads).  See attached profiler output.  Looks like we could save a bunch on object creation
if we had our own WritableFactories instance that treated stuff like NullInstance special
creating a Singleton NullInstance per declared class type returning these instead of creating
new ones.

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