Github user arunmahadevan commented on the issue:

    https://github.com/apache/spark/pull/23156
  
    @gaborgsomogyi what I meant was rather than exposing a config to control 
the internal queue sizes, we could have a higher level config like the max 
pending epochs. This would act as a back pressure mechanism to stop further 
processing until the pending epochs are committed. I assume this would also put 
a limit on the three queues.


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