Github user xueyumusic commented on the issue:
https://github.com/apache/spark/pull/21575
It seems that "spark.core.connection.ack.wait.timeout" and
"spark.shuffle.io.connectionTimeout" are used only in tests which might be
legacy and do not have an impact on normal code, and "spark.rpc.lookupTimeout"
don't have the same issue.
The only one for "spark.rpc.askTimeout" which I am not sure whether it is
an issue is
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/deploy/Client.scala#L229.
I am not sure whether it is a special case that force this config 10s when not
configured
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