Github user zsxwing commented on the issue:
https://github.com/apache/spark/pull/18388
@jinxing64 Since
[ExternalShuffleService](https://github.com/apache/spark/blob/a0fe32a219253f0abe9d67cf178c73daf5f6fcc1/core/src/main/scala/org/apache/spark/deploy/ExternalShuffleService.scala#L55)
will close idle connections, this looks like a connection leak. Could you dig
more to see if you can find any connection leak issue?
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