Github user tillrohrmann commented on the issue:
    I actually think that this does not fully stabilize the test case. The 
problem is the following: Waiting for all `Tasks` to be in state `RUNNING` is 
not sufficient but only necessary. The `StreamTask` can still be not running 
and thus the checkpoint gets rejected. I propose to add a `CountDownLatch` to 
the source function to signal when all sources are really running. Only then we 
will trigger the checkpoint.

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