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From "ASF subversion and git services (JIRA)" <>
Subject [jira] [Commented] (AMQ-6377) Introduce a periodic disk sync mode for KahaDB journal
Date Thu, 28 Jul 2016 14:08:20 GMT


ASF subversion and git services commented on AMQ-6377:

Commit 1a598277cf76e9bace980dfa87982584b5879710 in activemq's branch refs/heads/master from
[;h=1a59827 ]

Reworking patch so that a periodic disk sync uses a journal trace
command to trigger the sync so that everything is done in the same
thread for the writes

> Introduce a periodic disk sync mode for KahaDB journal
> ------------------------------------------------------
>                 Key: AMQ-6377
>                 URL:
>             Project: ActiveMQ
>          Issue Type: New Feature
>          Components: Broker, KahaDB
>    Affects Versions: 5.13.4
>            Reporter: Christopher L. Shannon
>            Assignee: Christopher L. Shannon
>             Fix For: 5.14.0
> KahaDB has two modes for journal disk syncs, either always sync for each write or never
sync.  I'm proposing that we add a third option, a period disk sync. 
> The intended behavior of this would be to run a task in the file appender that would
sync the file (if necessary) at some periodic interval (such as every 500 ms, or 1 second,
etc) instead of every write.  The file would also be synced on close (on file rollover or
> In my testing, syncing every 1 second has been proven to be nearly indistinguishable
performance as never disk syncing but is a safer option as you insure that a sync is performed
at least once per interval.

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