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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