[jira] [Created] (FLINK-14362) Change DefaultSchedulingResultPartition to return correct partition state

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

Zhu Zhu created FLINK-14362:
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             Summary: Change DefaultSchedulingResultPartition to return correct partition state
                 Key: FLINK-14362
                 URL: https://issues.apache.org/jira/browse/FLINK-14362
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Coordination
    Affects Versions: 1.10.0
            Reporter: Zhu Zhu
             Fix For: 1.10.0


Currently {{DefaultSchedulingResultPartition#getState()}} returns the state of partitions based on the partition producer's state. The state is used to make scheduling decision.

However, it does not correctly reflect the true state of a partition.
For example, when producer task turns to RUNNING but has not produced any data yet, it's consumers should not be scheduled to reduce unnecessary resource cost in lazy scheduling mode. However, the partition state will be RUNNING in {{DefaultSchedulingResultPartition}} and will trigger the scheduling of its consumers.

I'd propose to change the enums in {{ResultPartitionState}} to be:
* CREATED // partition is just created or is just reset
* CONSUMABLE // pipelined partition has data produced or blocking partition's parent result finishes. Corresponds to IntermediateResultPartition#isConsumable.

The CONSUMABLE state is what the scheduler cares to make scheduling decisions.

This change also relieves LazyFromSourcesSchedulingStrategy/InputDependencyConstraintChecker from partition states management.




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