Github user dding3 commented on the pull request:
https://github.com/apache/spark/pull/2956#issuecomment-67931182
We have tested the patch in below senarios and find it works :
1. Apply checkpoint. RDD has been flush to disk as expected
2. Doesn't apply checkpoint. There is no performance degradation, our
app(pagerank) only spend 1 more second compared to spark without patch
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