Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3444#issuecomment-67222433
I've opened a PR against this PR in order to add defensive checks to
MetricsSystem, which would have prevented the issue fixed by this PR:
https://github.com/jerryshao/apache-spark/pull/10
@jerryshao would be great if you could take a look at that and merge it
into this PR branch if it looks fine to you (I've opened it against this
branch).
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