[GitHub] [pulsar] volfco opened a new issue #5274: geo replicated subscribers

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volfco opened a new issue #5274: geo replicated subscribers
URL: https://github.com/apache/pulsar/issues/5274
 
 
   One of the big things missing in my book, is a way to have multiple subscribers across datacenters consume messages "exactly" once. 
   
   DC A produces 5 messages. DC A has a consume subscription named TEST. DC B has a consumer with the same name. Ideally, a consumer in DC A process messages 1,2,3 while DC B is able to process 4 and 5.
   
   From my admittedly limited research, I don't think this is currently supported. Subscribers cursor is currently per DC, which allows for consumers in each DC to consume the same message.
   
   I could implement this on the client side by using the configuration store zookeeper to record a "lock" on a message ID to disallow consumption on other consumers- but this seems like something that could be implemented inside the broker and configurable on a per-namespace level. 
   
   At the expense of consumption latency and zookeeper I/O, I think this would be an amazing feature.

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