Github user shivaram commented on a diff in the pull request:
https://github.com/apache/spark/pull/7742#discussion_r35785930
--- Diff: core/src/main/scala/org/apache/spark/api/r/RBackendHandler.scala
---
@@ -148,6 +151,9 @@ private[r] class RBackendHandler(server: RBackend)
case e: Exception =>
logError(s"$methodName on $objId failed", e)
writeInt(dos, -1)
+ // Writing the error message of the cause for the exception. This
will be returned
+ // to user in the R process.
+ writeString(dos, e.getCause.getMessage)
--- End diff --
Yeah it would be good to have a stack trace too but only the one from the
actual error and not one from RBackend
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