Hi

Q1:
Is .checkpoint() the same as .cache() but the difference is that it writes to 
disk instead of memory?

Q2:
When is the checkpointed data rewritten in a streaming context? I assume it is 
rewritten otherwise the file where the stream is checkpointed to would grow 
forever. Is it every batch_duration?
ie:
For  val streamingContext = new StreamingContext(conf, Seconds(10))  the 
checkpointed data would be rewritten every 10 seconds.

Thanks
-Adrian

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