Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/12597#discussion_r61350190
--- Diff: yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala ---
@@ -492,15 +492,30 @@ private[spark] class Client(
case None =>
// No configuration, so fall back to uploading local jar files.
- logWarning(s"Neither ${SPARK_JARS.key} nor ${SPARK_ARCHIVE.key}
is set, falling back " +
+ logInfo(s"Neither ${SPARK_JARS.key} nor ${SPARK_ARCHIVE.key} is
set, falling back " +
--- End diff --
I really think this should be a warning. Falling back into this mode means
your Spark app's startup time is much slower. People really should be aware
that they're falling into this case, and a warning helps more than an info log,
even if a tiny bit.
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