Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/9922#discussion_r45798494
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/api/python/PythonDStream.scala
---
@@ -48,6 +59,16 @@ private[python] trait PythonTransformFunction {
private[python] trait PythonTransformFunctionSerializer {
def dumps(id: String): Array[Byte]
def loads(bytes: Array[Byte]): PythonTransformFunction
+
+ /**
+ * After invoking `dumps` or `loads`, the user should use
`getLastFailure` to check if there is
+ * any failure in Python. If so, the user should handle properly, e.g.,
throw an exception with
--- End diff --
nit: Very verbose. Just simply say "Get the failure, if any, in the last
call to `dumps` or `loads`. Returns the failure message if there was a failure,
or `null` if there was not failure."
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