Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/410#issuecomment-74643785
I agree with Fabian that it is not a good default behavior to grab
everything that is possible.
It should be an explicit request by the user. For YARN single job sessions,
we can make this the default, otherwise it is not very friendly.
`getNumberOfAvailableSlots()` changes very fast during multi user
operation. Dusing single user operation between jobs (where I see the auto
parallelism useful), it is the same as `getTotalNumberOfSlots()`.
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