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[jira] [Created] (FLINK-9455) Make SlotManager aware of multi slot TaskManagers


Till Rohrmann created FLINK-9455:
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             Summary: Make SlotManager aware of multi slot TaskManagers
                 Key: FLINK-9455
                 URL: https://issues.apache.org/jira/browse/FLINK-9455
             Project: Flink
          Issue Type: Improvement
          Components: ResourceManager
    Affects Versions: 1.5.0
            Reporter: Till Rohrmann
             Fix For: 1.6.0, 1.5.1


The {{SlotManager}} responsible for managing all available slots of a Flink cluster can request to start new {{TaskManagers}} if it cannot fulfill a slot request. The started {{TaskManager}} can be started with multiple slots configured but currently, the {{SlotManager}} thinks that it will be started with a single slot. As a consequence, it might issue multiple requests to start new TaskManagers even though a single one would be sufficient to fulfill all pending slot requests.

In order to avoid requesting unnecessary resources which are freed after the idle timeout, I suggest to make the {{SlotManager}} aware of how many slots a {{TaskManager}} is started with. That way the SlotManager only needs to request a new {{TaskManager}} if all of the previously started slots (potentially not yet registered and, thus, future slots) are being assigned to slot requests.



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