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https://issues.apache.org/jira/browse/FLINK-14236?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhu Zhu updated FLINK-14236:
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Summary: Make LazyFromSourcesSchedulingStrategy do lazy scheduling based on
partition state only (was: Make LazyFromSourcesSchedulingStrategy do lazy
scheduling only based on partition state)
> Make LazyFromSourcesSchedulingStrategy do lazy scheduling based on partition
> state only
> ---------------------------------------------------------------------------------------
>
> 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
> Priority: Major
> 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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