merlimat opened a new pull request #13309:
URL: https://github.com/apache/pulsar/pull/13309


   ### Motivation
   
   RocksDB based implementation of MetadataStore right now can only be opened 
once, since it requires a single writer and it enforces it through a file lock. 
   
   To make it easier to configure different components which may be creating 
their own instances of MetadataStore, we should make `RocksDbMetadataStore` to 
work consistently as the other implementations, by using a static map of 
instances and reference counting to decide when it can really get closed.
   
   
   @Shoothzj PTAL


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