Github user sachingoel0101 commented on the pull request:
https://github.com/apache/flink/pull/1214#issuecomment-145059638
It doesn't really make sense to call `print` or `collect` in detached mode.
Even if the result is printed on JobManager, client cannot access it anyway
[short of going through the std out logs of JM].
Also, right now, the stack trace for this failure is uninformative.
I propose to explicitly disallow functions which access Accumulator results
in detached mode *viz* `count`, `collect` and `print`. What do you think?
We can provide a hint that a sink should be used instead in the exception
message.
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