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Posted to commits@cassandra.apache.org by "T Jake Luciani (JIRA)" <ji...@apache.org> on 2014/05/01 14:53:15 UTC

[jira] [Updated] (CASSANDRA-7128) Upgrade NBHM

     [ https://issues.apache.org/jira/browse/CASSANDRA-7128?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

T Jake Luciani updated CASSANDRA-7128:
--------------------------------------

    Summary: Upgrade NBHM  (was: Switch NBHS for CHS on read path )

> Upgrade NBHM
> ------------
>
>                 Key: CASSANDRA-7128
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7128
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: T Jake Luciani
>            Assignee: T Jake Luciani
>            Priority: Trivial
>              Labels: performance
>             Fix For: 2.1 beta2
>
>         Attachments: 7128.txt, Screen Shot 2014-04-30 at 11.07.22 PM.png
>
>
> AbstractRowResolver uses a NBHM for each read request.  
> Profiler flagged this as a bottleneck since the init() call creates a AtomicReferenceFieldUpdater which is stored in a synchronized collection.
> A NBHS is most certainly overkill for such a short lived object.  And turns out switching it to a CHS in my tests yields a ~5-10% read boost.



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