aloyszhang commented on pull request #9743:
URL: https://github.com/apache/pulsar/pull/9743#issuecomment-787017437


   @eolivelli 
   After this PR, if user want to use deadLetter policy and not custome the 
deadLetterTopic, the default deadLetterTopic is 
`tenant/namespace/{topicName}-{subscriptionName}-DLQ`. 
   -  topicName is the base partitioned topic name which can be got by 
`TopicName.getPartitionedTopicName()`
   
   For example, when enalbleRetry for a consumer with subscriptionName 
`subscription-test` and topic `public/default/topic-test`, if deadLetterTopic 
are not set, we should build a deadLetterTopic consumer to subscribe from the 
deadLetterTopic `public/default/topic-test-subscription-test-DLQ` instead of 
`public/default/subscription-test-DLQ`


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