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From Cliff Jansen <cliffjan...@gmail.com>
Subject Re: Straw Poll: proposal to remove certain features from qpidd
Date Wed, 08 Aug 2012 15:23:45 GMT
+1 for (a)

On Tue, Aug 7, 2012 at 11:11 AM, Gordon Sim <gsim@redhat.com> wrote:
> So, to follow up and summarise this thread so far, the only contentious
> point has been the loss of the 'flow to disk' functionality.
>
> Though the current solution doesn't limit the memory used by a large queue,
> it can in certain cases reduce the rate of memory growth which in turn may
> buy a little more time to resolve the root cause. So while those using it
> are less than fully satisfied, they are (understandably) concerned at having
> even this limited solution taken away without having any clear plan to offer
> a replacement.
>
> I have spent a little time thinking through what a better solution might
> look like and how much effort it would take. I believe that for ~3-5 weeks
> work I could get something better in place. It would be, in the first
> instance, posix only[1]. It would be mutually exclusive with lvq or priority
> queue options. However it would be a more effective limit on the memory
> consumed as such a queue grew, and (I hope) would have a less drastic
> performance penalty at larger sizes.
>
> There are a few options for how to proceed, and I'd like to take a quick
> straw poll to see which path the community favours.
>
> (a) go ahead with the refactor, including the removal of features mentioned
> in the previous mail, subsequently focus first on AMQP 1.0 support, only
> then return to add paged queue support
>
> (b) go ahead with the refactor, including the removal of features mentioned
> in the previous mail, subsequently focus first on paged queue support, then
> proceed to add AMQP 1.0 support
>
> (c) don't go ahead with the refactor until it can be combined with an
> alternative to flow to disk, and only then proceed with AMQP 1.0 support
>
> (d) don't go ahead with the refactor at all
>
> I myself favour (a). I think AMQP 1.0 support is more important and more
> work and would like to make more progress on that as soon as possible in
> order to have something ready for the 0.20 release. I can't guarantee that
> this path would result in the 0.20 release having the replacement for flow
> to disk functionality, but if not it would come soon after.
>
> I'm not so keen on (c) because maintain such a large patch against a
> continually moving trunk is a lot of work in itself and I think that time
> can be better spent. I'm not keen on (d) because I honestly don't think I
> can add decent 1.0 support (or fix a number of known issues) without
> something like this refactor.
>
> Anyway, over to you. Let me know what you think, I'm keen we reach some
> agreement by the end of the week. In the meantime I'll try and make my
> proposal for the flow to disk replacement a bit more concrete.
>
> --Gordon.
>
> [1] It will be designed such that it is relatively simple to provide
> alternative implementations for the posix functionality such that anyone
> with interest can easily add windows support for example. From what I can
> tell, it doesn't look like flow to disk is supported on windows at present
> anyway. I could be wrong.
>
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