wangjialing218 edited a comment on pull request #10129:
URL: https://github.com/apache/pulsar/pull/10129#issuecomment-814539432
@merlimat @codelipenghui Currently a cosumer with retry message enable could
receive another topic's retry message due to the same retry letter topic name.
Consider a consumer subscribe to a topic with retry topic enable, and
another consumer subscribe to another topic under same namespace with same
subscription name, both of the two consumers will subscribe to the retry topic
{NamespaceName}-{Subscription}-RETRY, and they could receive the retry messages
from each other.
Changing default name of retry letter topic will not cause compatibility
issues when users upgrade pulsar client, because consumer will automatic
subscribe the retry letter topic at builder time.
For dead letter topic, since user need to specify the topic name, we need to
consider how to handle the compatibility issue. such as only change the default
name of retry letter name?
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