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Date: Fri, 10 Sep 2010 10:08:30 +0100
Message-ID: <AANLkTimARX+OdPvJ7y8Gs9A1_+tfe-j+LLgOPWLfi1-P@mail.gmail.com>
Subject: Re: Consumer is not able to pick messages from queue
From: Gary Tully <gary.tully@gmail.com>
To: users@activemq.apache.org
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The named queue concept can be realized in configuration using
filtered destination that use selectors. see;
http://activemq.apache.org/virtual-destinations.html#VirtualDestinations-Us=
ingfiltereddestinations

As the selectors are evaluated at send time there is no limit imposed
by sparse matching.

On 9 September 2010 21:19, Fredrik Jonson <fredrik@jonson.org> wrote:
> Gary Tully wrote:
>
>> =A0yea, this is a known issue with sparse selectors. increasing the
>> =A0maxPageSize via a destination policy entry for that queue will help a=
s
>> =A0it will ensure that more messages are held in memory for dispatch.
>
> Well, yes it helps, but only as long as the message your selector wants
> can be found within the configured page size.
>
>> =A0see: the comments on
>> =A0http://trenaman.blogspot.com/2009/01/message-selectors-and-activemq.h=
tml
>
> The last sentence on the above post offer a very good alternative. If you=
 need
> to adress messages by type and must be able to handle a backlog bigger th=
an
> what is possible to contain in the maxPageSize, replace your selectors wi=
th
> separate named queues, each specific for whatever you selected for before=
.
>
> This assumes that you do not have too many selectors though, and obviousl=
y
> that your selector queries can be mapped to named queues.
>
> --
> Fredrik Jonson
>
>


--=20
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