Zhu Zhu created FLINK-14236:
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Summary: Make LazyFromSourcesSchedulingStrategy do lazy scheduling only based on partition state
Key: FLINK-14236
URL:
https://issues.apache.org/jira/browse/FLINK-14236 Project: Flink
Issue Type: Sub-task
Components: Runtime / Coordination
Affects Versions: 1.10.0
Reporter: Zhu Zhu
Fix For: 1.10.0
The philosophy of lazy_from_sources scheduling is to schedule a task when its inputs are ready, i.e. when needed result partitions are consumable. It actually does not directly care whether a task is finished, though a finished task will lead its partitions to be consumable.
The {{LazyFromSourcesSchedulingStrategy}} currently does lazy scheduling in two ways:
1. trigger scheduling on FINISHED execution state for blocking partition consumers
2. trigger scheduling on partition consumable events for pipelined partition consumers
This makes the scheduling decision a bit messy. And it also requires the {{LazyFromSourcesSchedulingStrategy}} to manage the partition state by itself, to decide when a partition is consumable, which is not good.
I'd propose to make {{LazyFromSourcesSchedulingStrategy}} do lazy scheduling only based on partition state. This can make the scheduling decision making clearer and relieve {{LazyFromSourcesSchedulingStrategy}} from partition state management.
This work requires FLINK-14234 so that all partition consumable events can be notified.
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