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The declarative scheduler will be a beta feature which the user has to activate explicitly by setting the config option jobmanager.scheduler: declarative. It This entails that Flink's default behaviour won't change.

If the declarative scheduler is activated, then it will only be chosen if the user submitted a streaming job. If the user submitted a batch job, then Flink will fall back to the pipelined region scheduler.

Limitations & future improvements

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