Re: Concurrent Consumption of Messages Putting a lock on attribute
It sounds to me like you would want to put all the related messages into a
single message group  together.
On Thu, Dec 20, 2018 at 8:18 AM drunkKnight <upadhyaya.piyu@xxxxxxxxx>
> I have multiple servers that store 10000 users on each. Earlier because of
> less time, I was using a Pub/Sub model for different events. It worked as
> Consider the case, where I had to do an OTP verification for a user then I
> would write it in DB and later the event to be executed in the DB by a CRON
> job and this way it gets consumed.
> Now I want to switch to MQs. I am pretty clear with the implementation idea
> but there is a small problem where I got stuck.
> So the story is:
> Consider a user A, on user's onboarding I create events like OTP,
> EmailVerification, and AllocateBonus. I'm planning to create a shared queue
> between multiple servers that would have the messages (with an attribute
> user-id) in the queue and will also publish it to a topic (where the topic
> will be the user-id) and a consumer will consume the topic. Once the topic
> gets emptied, it will get deleted.
> Now the problem is: consider the user A with messages like
> and AllocateBonus. Consumer 1 takes up the EmailVerification event, looks
> for the user-id in it and then looks for the events in TOPIC- A. At the
> time, consumer 2 takes up the event AllocateBonus and looks for the user-id
> in it and then starts executing it.
> So before consumer 1 gets completed, consumer 2 will finish and there will
> be no bonus allocated to the user because email is not verified.
> PROBLEM: I want to acquire a lock on an attribute of the message so that
> events of the same user-id does not get executed by different consumers
> without maintaining the order of execution. I have looked up for this but
> could not find anything. Is there anyone here who is aware of such
> functionality in ActiveMQ? It would be of great help.
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