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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