Greetings,

This is my first post. Sorry for this beginner's question.

I have read some docs on how to configure OpenStack to use Highly available 
rabbitmq. Looks like simply configuring services with all queue nodes in that 
HA cluster would work.

--Do the services that use HA queue ensure the message sequencing?

For example, if message mirroring/syncing between nodes fails or delays for 
some reason, some messages that required to be delivered prior to others may 
get delivered late. Is the service consuming this queue cluster ensuring the 
sequence or does RabbitMQ somehow do it?(this is unlikely as messages may get 
delayed while they are being sent to the queues and the queues wouldn't even 
know so)

Thank you!

Xicheng


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