Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/7253#issuecomment-121066858
> Did you consider all possibilities?speculative execution??
There's no such thing as speculative execution of app attempts.
> if a1 start at same time as a2 (if not later by definition of attempts)
That should never happen (see above, attempts are only started after a
previous attempt has finished).
> Especially as that is the case @tgravescs argues in his SPARK-8593
No it's not. The case he described is when the first attempt finished
executing (i.e. there's no live SparkContext anymore) but the *log file* where
the attempt was writing its logs wasn't properly closed. There are never two
attempts executing at the same time, and it's a safe assumption that if there
is more than one attempt, all attempts except the most recent one (i.e. the one
with the most recent start time) are not running.
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