rdhabalia opened a new pull request #1647: Fix: remove local-cluster from 
replication list of global-namespace should clean topics
URL: https://github.com/apache/incubator-pulsar/pull/1647
 
 
   ### Motivation
   
   Right now, if we remove local-cluster from repl-cluster list of the global 
namespace then that local pulsar cluster doesn't serve any request for all 
topics under that namespace because local-cluster is not part of the repl 
clusters. Therefore, broker rejects all admin stats and lookup call for those 
topics and topics become useless.
   So, broker should clean and delete all topics under "global" namespace if 
local cluster is not part of repl-cluster list.
   
   ### Modifications
   
   Delete topics forcefully once local cluster is removed from repl-cluster 
list of global namespace.
   
   ### Result
   
   Removing local cluster from repl-cluster list of a global namespace will 
delete topics and don't keep unnecessary metadata into zk.
   

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