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From "Guillaume Nodet (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (GERONIMO-6373) Expose HOWL flushPartialBuffer config via HOWLLog - useful under low concurrency
Date Tue, 24 Jul 2012 12:17:34 GMT

     [ https://issues.apache.org/jira/browse/GERONIMO-6373?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Guillaume Nodet reassigned GERONIMO-6373:
-----------------------------------------

    Assignee: Guillaume Nodet  (was: David Jencks)
    
> Expose HOWL flushPartialBuffer config via HOWLLog - useful under low concurrency
> --------------------------------------------------------------------------------
>
>                 Key: GERONIMO-6373
>                 URL: https://issues.apache.org/jira/browse/GERONIMO-6373
>             Project: Geronimo
>          Issue Type: Bug
>      Security Level: public(Regular issues) 
>          Components: transaction manager
>    Affects Versions: 2.2.1
>            Reporter: Gary Tully
>            Assignee: Guillaume Nodet
>         Attachments: GERONIMO-6372.patch
>
>
> HOWL XALogger supports flushPartialBuffers which is not configurable via Geronimo HOWLLog.
It is useful in the case of low concurrency.
> It would be great to have this exposed in the HOWLLog constructor so that it be be configured.
> {code}  /**
>    * Indicates whether LogBufferManager should flush buffers
>    * before they are full.
>    * 
>    * <p>Normally, buffers are flushed to disk only when
>    * they become full.  In lightly loaded situations,
>    * one or more threads may have to wait until the
>    * flushSleepTime expires before the buffer is written.
>    * In the worst case, a single thread is using the
>    * log, and every put() with sync requested will
>    * be delayed flushSleepTime ms before the buffer is
>    * written.
>    * 
>    * <p>Setting flushPartialBuffers true will allow
>    * the LogBufferManager to flush buffers to disk
>    * any time the channel is not busy.  This improves
>    * throughput in single threaded and lightly loaded
>    * environments. 
>    * 
>    * <p>By default, this feature is disabled (false) to
>    * provide compatability with earlier versions of
>    * this library.
>    */
>   private boolean flushPartialBuffers = false;{code}

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