Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/9258#issuecomment-152154426
@zsxwing I took a quick look and I have a high level question. Why not just
do the checkpointing iterator? IIUC this approach involves reading the iterator
back from disk to return the values. Wouldn't that be potentially expensive?
Also, this doesn't fix it for local checkpointing.
If we have a general checkpointing iterator, then RDD doesn't have to
change much and we don't need to introduce another `CheckpointManager`, which I
find a little clunky.
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