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https://issues.apache.org/jira/browse/QPID-3774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13190071#comment-13190071
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Rob Godfrey commented on QPID-3774:
-----------------------------------
Change made to 0-10 codepath to implement this optimisation. A similar change
should be possible to the 0-8/0-9/0-9-1 codepath.
the change only affects the BDB store (or other 3rd party stores that might
implement asynchronous commits). The Derby store does not implement
asynchronous commits and thus gains no advantage through this change.
> [Java Broker] Allow out of order completion of persistent enqueues / dequeues
> -----------------------------------------------------------------------------
>
> Key: QPID-3774
> URL: https://issues.apache.org/jira/browse/QPID-3774
> Project: Qpid
> Issue Type: Improvement
> Components: Java Broker, Java Broker BDB Store
> Affects Versions: 0.14
> Reporter: Rob Godfrey
> Assignee: Rob Godfrey
> Fix For: 0.15
>
>
> Currently each persistent enqueue or dequeue in a non transactional session
> is processed in strict order with a synchronous write occurring for each
> enqueue/dequeue.
> In order to improve performance we should make these enqueues/dequeues
> asynchronous and only wait for completion when a sync is requested.
> Note that due to the way the IO layer works, we cannot make this truly
> asynchronous as we need to synchronize before control is handed back to the
> IO layer as it then performs a blocking read. if the client is waiting for
> the completion from the broker it will never send more data on the wire, and
> since the read is blocking the broker cannot check to see if the async write
> to disk has completed. In practice tests have shown that this does not
> significantly change the maximum possible throughput.
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