Github user mxm commented on the pull request:
https://github.com/apache/flink/pull/1214#issuecomment-146874010
Before interactive programs were allowed, the detached mode would have been
worked fine because a single JobGraph would have been transferred to the job
manager and executed there. This doesn't make sense now, unless we have another
dedicated Executor (like you proposed). If that one is on the job manager, we
need a fault tolerance mechanism there. Even after the HA changes, the Client
is still the a single point of failure for interactive programs.
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