Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/2047#issuecomment-222640704
I would do one change here: Make the `isRunning` flag non transient, and
set it to true initially, rather than in open.
That can act as a safeguard against very early stopping (before open is
even completed), were stop would set the flag to false, and open would set it
back to true.
I think the runtime does prevent open to happen after stop, but cannot hurt
to guard this in the source as well.
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