Github user gengliangwang commented on a diff in the pull request:
https://github.com/apache/spark/pull/23189#discussion_r237972852
--- Diff: core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala ---
@@ -813,14 +813,14 @@ private[spark] class SparkSubmit extends Logging {
mainClass = Utils.classForName(childMainClass)
} catch {
case e: ClassNotFoundException =>
- logWarning(s"Failed to load $childMainClass.", e)
+ logError(s"Failed to load class $childMainClass.")
--- End diff --
Here I tried append `e.getMessage` to the output, but it seems the error
message equals the class name `childMainClass`. e.g.
```
Error: Failed to load class foo: foo.
```
So I think we can output without the exception message.
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