[jira] [Assigned] (FLINK-27251) Timeout aligned to unaligned checkpoint barrier in the output buffers of an upstream subtask

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

     [ https://issues.apache.org/jira/browse/FLINK-27251?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Piotr Nowojski reassigned FLINK-27251:
--------------------------------------

    Assignee: fanrui

> Timeout aligned to unaligned checkpoint barrier in the output buffers of an upstream subtask
> --------------------------------------------------------------------------------------------
>
>                 Key: FLINK-27251
>                 URL: https://issues.apache.org/jira/browse/FLINK-27251
>             Project: Flink
>          Issue Type: Improvement
>          Components: Runtime / Checkpointing
>    Affects Versions: 1.14.0, 1.15.0
>            Reporter: fanrui
>            Assignee: fanrui
>            Priority: Major
>             Fix For: 1.16.0
>
>
> After FLINK-23041, the downstream task can be switched UC when {_}currentTime - triggerTime > timeout{_}. But the downstream task still needs wait for all barriers of upstream. 
> If the back pressure is serve, the downstream task cannot receive all barrier within CP timeout, causes CP to fail.
>  
> Can we support upstream Task switching from Aligned to UC? It means that when the barrier cannot be sent from the output buffer to the downstream task within the [execution.checkpointing.aligned-checkpoint-timeout|https://nightlies.apache.org/flink/flink-docs-release-1.14/docs/deployment/config/#execution-checkpointing-aligned-checkpoint-timeout], the upstream task switches to UC and takes a snapshot of the data before the barrier in the output buffer.
>  
> Hi [~akalashnikov] , please help take a look in your free time, thanks a lot.



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