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Posted to issues@hbase.apache.org by "stack (Updated) (JIRA)" <ji...@apache.org> on 2011/12/16 20:50:30 UTC

[jira] [Updated] (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:all-tabpanel ]

stack updated HBASE-5056:
-------------------------

    Component/s: performance
    Description: 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.
        Summary: [performance] On upload, 4% of memory allocations are NullInstance  (was: [performance] On upload )
    
> [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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