[GitHub] [flink] tillrohrmann commented on pull request #13628: [FLINK-19552][runtime] Get preferred locations of an ExecutionSlotSharingGroup only for its executions from the scheduled bulk

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tillrohrmann commented on pull request #13628:
URL: https://github.com/apache/flink/pull/13628#issuecomment-708377123


   A somewhat related question concerning the `ExecutionSlotSharingGroup` is the following: How will the `ExecutionSlotSharingGroup` be calculated if we have the following JobGraph:
   
   ```
   v1 --> v2
   v3 --> v4
   ```
   
   here `v1, v2, v3, v4` are `JobVertices` and `-->` is a blocking data exchange. Given this specification we can say that neither `v1` and `v2` can share slots because of the blocking data exchange. The same applies for `v3` and `v4`. However, `v3` or `v4` could share the slot with `v1`. How is this solved? Will the effective execution slot sharing group for `v1` contain `v3` and `v4`?


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