J-HowHuang opened a new pull request, #18693:
URL: https://github.com/apache/pinot/pull/18693

   ## Description
   In https://github.com/apache/pinot/pull/17785 it changes the behavior of how 
throttler concurrency configs are updated.
   
   
   | | server config | cluster config | original behavior | after #17785 |
   |--|---|---|--|--|
   |maxConcurrency| 4 | null | 4 | `Integer.MAX_VALUE`|
   |maxConcurrencyBeforeServingQueries| 4 | 8 | 8 | 8|
   
   Because after #17785, in `updateThrottlerIfConfigChanged` we update both 
config to the values in the cluster config if either one of them is changed.
   
   ## Change
   Update the throttler permit if only it's changed in the cluster config (so 
that it matches the original behavior)


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