rdhabalia commented on issue #2400: PIP-22: Dead Letter Topic
URL: https://github.com/apache/incubator-pulsar/pull/2400#issuecomment-415927753
   I agree with @merlimat , I can see two major drawbacks with server-side 
implementation, which may prevent us to enable this feature with high traffic 
pulsar system: 
   a. memory footprint required by producer queues
   b. authroization handling because publish will happen on-behalf of consumer 
by broker.
   DLQ mainly requires count of message redelivery and then publish 
max-redelivered message  to the DLQ. Same message can be re-delivered to 
different consumers so, client can't track of redelivery-count of a specific 
message. so, client can rely on broker to get that count and publish that 
message to DLQ and ack the message on original topic. I think client-side 
implementation can make it simpler to use this feature.

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