Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/22796
You can can figure out what's going on by looking at the output of mvn
dependency:tree, potentially with the "-Dverbose" option.
If there is more than one transitive dependency that depends on the old
netty, then most probably this dependency exists to enforce that this
particular version is used; otherwise IIRC maven's resolution is "nearest
first" which may pick the older version.
If there is a single transitive dependency using the old netty, then it can
be removed, even though the downgrade is a little weird.
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