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From Gary Tully <>
Subject Re: prefetchExtension off-by-1 for transacted consumers with prefetchSize > 0
Date Thu, 18 Mar 2010 19:58:22 GMT
The prefetch extension in the transacted case is necessary for the case
where a transacted consumer wants to consumer more than prefetch messages in
a single transaction. Without the extension, the broker would see a full
prefetch and not dispatch any more and a receive could block.

On 15 March 2010 21:31, rodos77 <> wrote:

> JIRA AMQ-2651 opened.
> I would be happy to provide a patch but as I stated in my original post, I
> don't fully understand the need for prefetchExtension in the case of a
> transacted, asynchronous (prefetchSize > 0) consumer.  If somebody could
> explain it, that would perhaps give me the required knowledge to come up
> with a patch.
> The way I see it now, I would get rid of the prefetchExtension (in the
> above
> mentioned case) all together, but again I'm probably missing some piece of
> information and I don't want to cause any side effects.  Barring that, I
> think there is an off-by-1 error in its calculation but I need this
> confirmed in order to create a proper patch.
> --
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