[jira] [Created] (FLINK-4459) Introduce SlotProvider to Scheduler

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-4459:
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             Summary: Introduce SlotProvider to Scheduler
                 Key: FLINK-4459
                 URL: https://issues.apache.org/jira/browse/FLINK-4459
             Project: Flink
          Issue Type: Improvement
          Components: Scheduler
            Reporter: Till Rohrmann


Currently the {{Scheduler}} maintains a queue of available instances which it scans if it needs a new slot. If it finds a suitable instance (having free slots available) it will allocate a slot from it.

This slot allocation logic can be factored out and be made available via a {{SlotProvider}} interface. The {{SlotProvider}} has methods to allocate a slot given a set of location preferences. Slots should be returned as {{Futures}}, because in the future the slot allocation might happen asynchronously (Flip-6).

In the first version, the {{SlotProvider}} implementation will simply encapsulate the existing slot allocation logic extracted from the {{Scheduler}}. When a slot is requested it will return a completed or failed future since the allocation happens synchronously.

The refactoring will have the advantage to simplify the {{Scheduler}} class and to pave the way for upcoming refactorings (Flip-6).



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