buptljy commented on issue #7412: [FLINK-10866][Runtime] 1. Explicitly enable 
qs server and proxy. 2. QS
URL: https://github.com/apache/flink/pull/7412#issuecomment-451843969
 
 
   > > @eaglewatcherwb Thanks for this PR!
   > > Agree to the "query-server.enable" configuration, but I'm not sure that 
we should prevent all the failures which are caused by this, because the 
queryable state may be a main feature for some business.
   > > I wonder that if we can enable this server by checking the 
registeredKvStates so that we can know if the uses are really using the feature.
   > 
   > @buptljy Thanks for the comments.
   > **checking the registeredKvStates** do you mean **registerQueryableState** 
in TaskExecutor ?
   
   The queryable state will be registered in KvStateRegistry when it is 
published, which enables you to know if users have queryable state, with 
kvStateRegistry in NetworkEnvironment.

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