Github user jerryshao commented on a diff in the pull request:
https://github.com/apache/spark/pull/7185#discussion_r33999784
--- Diff: python/pyspark/streaming/dstream.py ---
@@ -602,13 +602,17 @@ class TransformedDStream(DStream):
Multiple continuous transformations of DStream can be combined into
one transformation.
"""
- def __init__(self, prev, func):
+ def __init__(self, prev, func, transformFunc=None):
--- End diff --
Previously I use override to do it, but have several problem with
`TransformFunction`/`TransformDStream` deserialization problem. I guess it is
the derived class which makes deserialization error, so instead of using
`KafkaTransformFunction`/`KafkaTransformDStream`, I added one another field to
workaround this problem. I admitted this implementation is weird, do you have
any better suggestion?
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