Hi,

I have a long computing chain, when I get the last RDD after a series of 
transformation. I have two choices to do with this last RDD

1. Call checkpoint on RDD to materialize it to disk
2. Call RDD.saveXXX to save it to HDFS, and read it back for further processing

I would ask which choice is better? It looks to me that is not much difference 
between the two choices.
Thanks!


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