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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