Github user jerryshao commented on the pull request:
https://github.com/apache/spark/pull/4875#issuecomment-77303929
Does Spark Streaming's checkpoint fail to work for recovery?
IIUC from your description you want to recover the window using external
data (Cassandra), rather than recover from checkpoint data, and current
checkpoint is mutable to the code change, is that right?
Maybe this is a way to solve your problem, but I'm not sure is there any
other solution can solve your problem. Feeding into the source InputDStream
probably is another way compared to change the `WindowedDStream` code, like
feeding again from Kafka from the last offset, so you don't need to save the
data into another DB. Currently I've no concrete idea about this,
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