Github user rxin commented on the issue:
https://github.com/apache/spark/pull/16888
Are there specific benefits brought by updating to 4.1 of Netty? Netty is
so core to Spark that any bug in it would be extremely difficult to debug (yes
we have founds bugs in Netty and helped fix those in the past). So unless there
are significant benefits, please do NOT update to 4.1.
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