sijie opened a new issue #5825: Improve PulsarClusterMetadataSetup to make it 
idempotent
URL: https://github.com/apache/pulsar/issues/5825
 
 
   *Problem*
   
   Currently the cluster metadata setup can be interrupted if `/namespace` 
znode already exists.
   
   *Change*
   
   We need to improve the program to make it idempotent.
   
   1) try to use zookeeper `multi` to ensure certain atomicity if possible.
   2) make sure the program handle znode already exists correct.
   3) add a test case to cover the change.
   

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