Try PubSub+
If you haven't already, check out our new Developer Portal! You'll find useful information about Solace PubSub+ as well as handy resources to get you started.

Transacted sessions and order of messages

Hi all, I have a question. Suppose following publishing scenarios. All sessions are transacted, created from one particular connection, all steps are executed sequentially from one thread.

Scenario 1:
Session1.transaction1 --> 1,2
Session2.transaction2 --> 3,4
Session1.transaction3 --> 5,6

Scenario 2:
Session1.transaction1 --> 1,2
Session1.transaction2 --> 3,4
Session1.transaction3 --> 5,6

What are the messages order guarantees in Solace ?
According JMS spec ( " A transaction’s order of messages to a particular destination is significant"
It seems like in scenario 2 messages will be ordered and consumer will consume 1,2,3,4,5,6.
Am I right ?
What about scenario 1 ?


  • AaronAaron Member, Moderator, Employee Posts: 10 mod

    Hi Игорь Попов..! Yes, you're correct: the order of messages in both scenarios would be maintained, and the consumer would receive 1, 2, 3, 4, 5, 6. Even if you weren't to use transactions, order would be maintained since you're publishing from a single thread.

  • TomFTomF Member, Employee Posts: 4

    Expanding on what Aaron said, in general, the ordering rule in Solace is "the order on reception is preserved." In other words, what matters is the order the messages were received at the broker. For single threaded producers that's easy... :smile:

Sign In or Register to comment.