snazy opened a new pull request, #4543:
URL: https://github.com/apache/polaris/pull/4543

   The async executors can briefly reject work when the backing pool is 
saturated, especially with the SynchronousQueue based Vert.x executor. Treat 
that as temporary pressure instead of failing the task immediately.
   
   Rejected submissions are rescheduled after a short delay, unless the task 
was already cancelled or the executor is shutting down. Cancellation also 
clears the retry timer so we do not run cancelled work later.
   
   This is hardening work, not an immediate fix, because currently there are 
maybe a handful of tasks scheduled at once.


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