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From "Christopher L. Shannon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMQ-6377) Introduce a periodic disk sync mode for KahaDB journal
Date Wed, 27 Jul 2016 13:40:21 GMT
Christopher L. Shannon created AMQ-6377:
-------------------------------------------

             Summary: Introduce a periodic disk sync mode for KahaDB journal
                 Key: AMQ-6377
                 URL: https://issues.apache.org/jira/browse/AMQ-6377
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker, KahaDB
    Affects Versions: 5.13.4
            Reporter: Christopher L. Shannon
            Assignee: Christopher L. Shannon


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 shutdown)

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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