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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7128) Upgrade NBHM
Date Thu, 01 May 2014 13:44:15 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13986579#comment-13986579
] 

Jonathan Ellis commented on CASSANDRA-7128:
-------------------------------------------

New ticket or ninja?

> 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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