[jira] [Created] (FLINK-18034) Introduce PreferredLocationsRetriever

[Shang Yuanchun (Jira)]

Zhu Zhu created FLINK-18034:
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             Summary: Introduce PreferredLocationsRetriever
                 Key: FLINK-18034
                 URL: https://issues.apache.org/jira/browse/FLINK-18034
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Coordination
            Reporter: Zhu Zhu
            Assignee: Zhu Zhu
             Fix For: 1.12.0


Preferred locations based on state and inputs are scattered into multiple components, which makes it harder to reasoning the calculation and complicates those hosting components.

We can introduce a {{PreferredLocationsRetriever}} to be used by {{ExecutionSlotAllocator}} which returns preferred locations of an execution vertex and hides the details of the calculation from other components.



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