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From Gary Tully <gary.tu...@gmail.com>
Subject Re: Re: SystemUsage questions
Date Mon, 28 Jan 2013 12:07:26 GMT
that is correct. but that is why we have the usage limits. a really large
transaction will block pending space. We could support spooling to disk in
that scenario but folks have not requested it.


On 26 January 2013 04:14, SuoNayi <suonayi2006@163.com> wrote:

> Thank for your clarification.
> I have just took a glance at the source code for 5.8, and found that the
> default
> memory usage limit is 64M still, another limits are improved and an new
> scheduler
> job store limit is  introduced.Some checks are performed but memory limit
> for
> destinations are not checked.
> I found MemoryTransactionStore is still to used to hold penging messages of
> transactions, more large transaction more messages are kept in RAM still
> and
> eventually memory will be exhausted.
> Does I miss something?
>
>
> Thanks
> SuoNayi
>
> At 2013-01-25 20:07:46,"Christian Posta" <christian.posta@gmail.com>
> wrote:
> >Sorry, i mean to say "scheduled messagaes do use their own store, not temp
> >store"
> >
> >
> >On Fri, Jan 25, 2013 at 4:58 AM, Christian Posta
> ><christian.posta@gmail.com>wrote:
> >
> >> To add:
> >>
> >> scheduled messages don't use their own store. they are currently
> >> unbounded, but this has been resolved here:
> >> https://issues.apache.org/jira/browse/AMQ-4068
> >>
> >>
> >> On Fri, Jan 25, 2013 at 4:24 AM, Gary Tully <gary.tully@gmail.com>
> wrote:
> >>
> >>> the defaults increased for 5.7 and there are additional warnings but i
> >>> think there is still some room for improvement. maybe peek at a 5.8
> snap.
> >>>
> >>> also, pending messages in a transaction do now respect the limits.
> >>>
> >>>
> >>> On 25 January 2013 08:20, SuoNayi <suonayi2006@163.com> wrote:
> >>>
> >>> > Hi, I know that SystemUsage is used to control memory usage(to cache
> >>> > messages) ,
> >>> > disk space usage for messages storage in the broker and we can
> allocate
> >>> > memory
> >>> > usage for each destination while others can not be assigned
> >>> independently.
> >>> > I just noticed that there is no SystemUsage section present but the
> >>> memory
> >>> > usage limit is enabled for queues in activemq.xml on my production
> >>> brokers.
> >>> > In this case broker will create a default SystemUsage with 64M memory
> >>> usage
> >>> > limit.But the memory usage limit for queues is 512M, and that's
> bigger
> >>> > than the
> >>> > memory usage limit of the broker.So in fact the memory usage limit
> for
> >>> > queues
> >>> > is only 64M rather than 512M and I do expect there are some
> >>> warning/error
> >>> > logs
> >>> > to indicate unreasonable configuration but not.If there are no jiras
> >>> about
> >>> > the
> >>> > problem should I raise one now?
> >>> >
> >>> >
> >>> > By the way,Does the temp store for non-persistent messages, pending
> >>> > transactional
> >>> > messages and schedule messages respect the limit of SystemUsage?
> >>> > I know that pending transactional  messages are kept in memory can
> cause
> >>> > OOM and
> >>> > later release will save them into the temp store.Is it implemented
> since
> >>> > 5.6?
> >>> >
> >>> >
> >>> > Thanks,
> >>> > SuoNayi
> >>> >
> >>> >
> >>> >
> >>> >
> >>> >
> >>> >
> >>> >
> >>> >
> >>> >
> >>> >
> >>> >
> >>> >
> >>>
> >>>
> >>> --
> >>> http://redhat.com
> >>> http://blog.garytully.com
> >>>
> >>
> >>
> >>
> >> --
> >> *Christian Posta*
> >> http://www.christianposta.com/blog
> >> twitter: @christianposta
> >>
> >
> >
> >
> >--
> >*Christian Posta*
> >http://www.christianposta.com/blog
> >twitter: @christianposta
>



-- 
http://redhat.com
http://blog.garytully.com

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