I assume you have multiple consumers. In this case, order is *not*
preserved.
Please see this page:
http://activemq.apache.org/how-do-i-preserve-order-of-messages.html
On Sep 17, 2007, at 5:47 PM, wojtek.z wrote:
Howdy
We are currently experiencing a bit of a problem with one of our
applications which relates to messages being retrieved from the
queue not in
order / sequence.
The basic idea is as follows
We create 3 sets of messages
Each message is tagged to a unique group
Each message is tagged with a sequence number of 1 - 3
Each message is sent to the queue separately
Now when we view the queue the messages are lined up in order ( ie
Group A =
1 , 2 , 3 )
When we retrieve the messages though there is a very high chance
that the
messages dont come off the queue in the order they were put on
there. If we
have to sets of 3 messages ( from group A / B ) they tend to come
across
along the lines of A1 , B1 , A3 , B3 , A2 , B2. Now sometimes they
shuffle
around sometimes they come of the queue properly ( mostly only when
1 set of
messages is active any more then that and the order breaks )
The way we retrieve the messages is also very simple, we simply
poll the
queue and grab each message one by one.
I did some reading and there were a few bugs reported back in
version 4.0.x
that mentioned these problems. I tried this exercise with versions
4.0.1 and
4.1.1 and neither seem to work correctly.
Is there a work around to this problem or maybe I am just doing
something
very silly that is causing this. Anyway if someone could let me
know that
would be most beneficial. Thanks !
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http://itsallsemantics.com
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