[jira] [Updated] (FLINK-14236) Make LazyFromSourcesSchedulingStrategy do lazy scheduling based on partition state only

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

     [ https://issues.apache.org/jira/browse/FLINK-14236?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zhu Zhu updated FLINK-14236:
----------------------------
    Fix Version/s:     (was: 1.10.0)
                   1.11.0

> 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: 1.11.0
>
>
> 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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