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Posted to issues@hbase.apache.org by "Zhihong Yu (Commented) (JIRA)" <ji...@apache.org> on 2011/12/16 20:56:30 UTC
[jira] [Commented] (HBASE-5056) [performance] On upload, 4% of
memory allocations are NullInstance
[ 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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