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Motivation
In order to support the reactive mode (FLIP-159) we need a different type of scheduler which first announces the required resources and only after having received the resources decides on the actual parallelism with which to execute the job. This has the benefit that this scheduler can schedule jobs if not all required resources are fulfilled. Moreover, it allows to continue executing jobs even after TaskManagers
have been lost. The declarative scheduler builds upon the declarative resource management (FLIP-138).
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