Github user mxm commented on the pull request:
https://github.com/apache/flink/pull/1412#issuecomment-161318473
Does it have to be an extra startup mode? How about you instantiating both
`ExecutionEnvironment` and `StreamExecutionEnvironment` during startup of the
shell? We could bind them to `batchEnv` and `streamEnv` respectively. I think
it would be nice not having to figure out how which parameter to supply for the
shell.
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