Github user tdas commented on the pull request:
https://github.com/apache/spark/pull/8087#issuecomment-130091909
I think you can make a generic equivalent of scalatest `eventually` in
python. That takes care of failing with timeout and providing meaningful last
error message.
```
def eventually(timeout, condition, errorMessage)
# condition: function that must return boolean
# errorMessage: can be a string, or a function that returns a string, it
invoked if there is a timeout.
```
Then thats solves the problem I alluded to earlier about a possible race
condition.
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