Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3849#issuecomment-68404316
/cc @koeninger, who raised this issue on the mailing list, and @yhuai, who
filed the original JIRA issue.
Also, /cc @pwendell, @andrewor14, and @tdas for review.
Technically, this changes the behavior of `attemptId`; I'd argue that the
old behavior was a bug, but we should consider whether we need to preserve it
and introduce a new method which returns the attempt number. I don't think
there's anything particularly useful that you can do with the taskId, but maybe
I'm mistaken.
Also, "attempt number" would be a better name than "attempt ID", but I
think we're kind of stuck with attemptId for binary compatibility reasons.
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