chenboat opened a new issue #7491:
URL: https://github.com/apache/pinot/issues/7491


   We tried to expand a broker tenant _A_ by adding the tenant tag _A_ to a few 
free brokers (via Controller UI). We observed that the new added brokers 
started to accept queries even though table re-assignment through Helix is 
still ongoing. This caused the broker to throw TableNotFound exceptions. This 
problem is particularly serious if the tenant has a lot of tables and queries. 
-- which means the Helix transition take longer time to finish. 
   
   The new added brokers should not start accepting queries until the table 
reassignment through Helix is done.    


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