Github user sachingoel0101 commented on the pull request:
https://github.com/apache/flink/pull/1214#issuecomment-152990620
The lastEnv is set for blocking also, because it still makes sense. It just
stores what the last environment created by the factory was.
I worked on this a while back while fixing a bug(?) in `TestEnvironment`
which was meant to allow accessing last created environments.
[https://github.com/apache/flink/commit/166b3705c9079efafe9217d98e7edaf54e6a84cf]
Whether it is accessed or not is an entirely different matter IMO.
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