Github user mxm commented on the pull request:
https://github.com/apache/flink/pull/1214#issuecomment-145044584
The current version of the detached mode doesn't really work for eager
execution calls like `count()` or `collect()`. Those calls will also be
executed detached and thus the result will never be available. I think we can
only get this to work if we move the handling of the eager execution into the
JobManager.
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