[jira] [Created] (FLINK-20721) Remove unknown input channels and process to update partitions

["Zhu Zhu (Jira)" <ji...@apache.org>]

Zhu Zhu created FLINK-20721:
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             Summary: Remove unknown input channels and process to update partitions
                 Key: FLINK-20721
                 URL: https://issues.apache.org/jira/browse/FLINK-20721
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Coordination, Runtime / Network
    Affects Versions: 1.13.0
            Reporter: Zhu Zhu
             Fix For: 1.13.0


With the latest pipelined region scheduling, Flink no longer launch a task before knowing the locations of all the partitions it consumes. `scheduleOrUpdateConsumers` is no longer needed so we removed it in FLINK-20439.

Unknown input channels and the process to update it is also no longer needed. I'd propose to remove them and the benefits are:
1. simplifying the code of both scheduler and shuffle components
2. simplifying interfaces of ShuffleEnvironment and ShuffleDescriptor 
3. ensure the assumptions in InputGate#resumeConsumption() implementations
4. allow to remove ScheduleMode#allowLazyDeployment() and later completely remove ScheduleMode





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