Github user CodingCat commented on the pull request:
https://github.com/apache/spark/pull/639#issuecomment-42182222
for the future update of the PR
I think for this specific case, what @aarondav proposed is a pretty good,
as we can keep the running of CompleteRecovery in the main thread
for schedule(), I think we also need to ensure schedule is always called in
the main thread
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