Technoboy- commented on pull request #13337:
URL: https://github.com/apache/pulsar/pull/13337#issuecomment-996589841


   Hi , @shibd .
   Sorry for the late response.
   The root issue is that: when deleting namespace, the  
`deleteNamespaceBundleAsync`  may execute before 
`systemTopic.deleteForcefully()`.  In `deleteNamespaceBundleAsync`, it will 
check the namespace bundle, and find the system topic reader own the bundle 
then throw `Cannot delete non empty bundle`.  
   If the two request execute orderly (`systemTopic.deleteForcefully()` -> 
`deleteNamespaceBundleAsync`),  `systemTopic.deleteForcefully()` will close the 
reader first and then delete the topic . So 
https://github.com/apache/pulsar/blob/7f5b9740281c0f4a0ede8be93274cb60974a4ba7/pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/NamespacesBase.java#L560
 will not contain the topic and no exception thrown.


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