Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/17203
With cached KafkaConsumer, by default the largest connections per executor
would be 64, in your case 64 may not enough. Your fix looks not so solid and
cannot explain why shifting to uncached one then the issue is resolved. Maybe
you should dig more to see if there's any other problems which lead to your
issue here.
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