Github user sachingoel0101 commented on the pull request:
https://github.com/apache/flink/pull/1214#issuecomment-146914064
There are three root causes(please add if I've missed any.)
1. Call to execute twice
2. Access job execution results.
3. Executing one of the eager execution methods as the first part of
program. [Second time is automatically a failure]
We can handle all three easily. If a program doesn't have any of these, it
shouldn't be failed.
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