Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/7742#discussion_r35783283
--- 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 --
would it make sense to write the stack too? often time it is much more
useful to have the call stack in additional to the exception message
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