rayliu419 opened a new issue #11698:
URL: https://github.com/apache/pulsar/issues/11698


   Hi team, 
   
   I can't find a template to ask general question so I just post it here, 
please direct me to the right template/place if I am wrong. 
   
   1. Kafka(<2.8) use ZK to do leader broker election, as far as I know, when 
doing rolling update, when the leader broker update, the kafka cluster needs to 
select a new leader. During the time, the whole cluster can't offer service(at 
least not for write). I searched some pages and found Pulsar also has a concept 
called leader broker, does that also happens in Pulsar? 
   
   2. It seems Pulsar use ZK a lot, e.g., store meta data such as 
topic/namespace/tenants information, does that affect the cluster performance 
when the cluster is large? The configuration rarely changes so I think that's 
OK, but the meta data such as consumer offset change frequently, so I guess ZK 
will be a bottleneck of the whole cluster? 
   
   Thanks, 
   
   Rui 
   


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