[jira] [Updated] (FLINK-28884) Downstream task may never be notified of data available in hybrid shuffle when number of credit is zero.

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

     [ https://issues.apache.org/jira/browse/FLINK-28884?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Weijie Guo updated FLINK-28884:
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    Summary: Downstream task may never be notified of data available in hybrid shuffle when number of credit is zero.  (was: When there is no credit in the downstream, there is a problem in the logic of informing data readability)

> Downstream task may never be notified of data available in hybrid shuffle when number of credit is zero.
> --------------------------------------------------------------------------------------------------------
>
>                 Key: FLINK-28884
>                 URL: https://issues.apache.org/jira/browse/FLINK-28884
>             Project: Flink
>          Issue Type: Bug
>          Components: Runtime / Network
>    Affects Versions: 1.16.0
>            Reporter: Weijie Guo
>            Priority: Major
>             Fix For: 1.16.0
>
>
> HsSubpartitionView should be initialized to a notifiable state, there may be a problem of never consuming otherwise.
> Imagine the following situation: Downstream task has no initial credit(i.e. exclusive buffers is configured to zero), if there is no data output in the upstream, it will feedback a zero backlog to downstream input channel. All subsequent data available notifications will be intercepted as needNotify is false.



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