sijie opened a new issue #3689: provide a *unack* mechanism to unack a message if the consumer can't process URL: https://github.com/apache/pulsar/issues/3689 **Is your feature request related to a problem? Please describe.** currently there is no way to only unack a message if the consumer can't process the message. **Describe the solution you'd like** provide a *unack* method like `ack`. when a consumer *unack* a message, broker should deliver the message to other consumers in the shared subscription. *unack* is probably only making sense in *shared* subscription. **Describe alternatives you've considered** do this in application layer, e.g. close the consumer and force broker to redeliver all the *unacked* messages to other consumers. it might work, but it is not an elegant solution. **Additional context** N/A
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