WorkQueuePolicy - understand "disjoint filter subjects"

[Kilio22]

Hi,

I am new to NATS, and I am playing with Jetstream and the different retention policies, especially the WorkQueuePolicy.
I noticed in the following example https://natsbyexample.com/examples/jetstream/workqueue-stream/go that you cannot create two consumers with overlaping filtrer subjects.

However, I manage to do the following using nats-cli and a local nats-server started in Jetstream mode:

• create a stream with toto.> as subject
• create a first pull consumer with toto.*.tata as subject
• create a second pull consumer with toto.> as subject

Here, to me the subjects are overlaping, as both can match a message published on a subject such as toto.tutu.tata.
I was thinking that maybe it would result in receiving a message published on subject toto.tutu.tata only on the first consumer, but no, it is received by both consumers.

Could you explain why please?

Thanks!

[derekcollison]

WorkQueue based streams allow only one consumer, but you can attach as many applications as desired. You might look at InterestPolicy instead for your needs.

[derekcollison]

Actually I was wrong, you can have multiple as long as they are not overlapping. Seems we may have a bug, looking with Ivan now. Apologies!

[derekcollison]

Ivan found the issue and PR coming shortly and will be part of next release which is scheduled for tomorrow. Thanks for the report! Will let @kozlovic provide more info.

[Kilio22]

Glad to help!

[kozlovic]

I have created an issue (#3639) from this discussion and will have a PR shortly.