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https://issues.apache.org/jira/browse/HBASE-5056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13171183#comment-13171183
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Zhihong Yu commented on HBASE-5056:
-----------------------------------
0.90 has the same code:
{code}
instanceObj = new NullInstance(declClass, conf);
{code}
So I guess this wouldn't explain the difference in performance.
> [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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