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https://issues.apache.org/jira/browse/FLINK-28386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17724809#comment-17724809
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Piotr Nowojski commented on FLINK-28386:
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Hi [~Jiang Xin], thanks! I guess it depends what you mean by "sin operators". 
Just checking tail/the most downstream operators - yes. Literally 
{{SinkOperator}} probably not, as that could be a fragile check.

> Trigger an immediate checkpoint after all sources finished
> ----------------------------------------------------------
>
>                 Key: FLINK-28386
>                 URL: https://issues.apache.org/jira/browse/FLINK-28386
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Runtime / Checkpointing
>            Reporter: Yun Gao
>            Assignee: Jiang Xin
>            Priority: Major
>
> Currently for bounded job in streaming mode, by default it will wait for one 
> more checkpoint to commit the last piece of data. If the checkpoint period is 
> long, the waiting time might also be long. to optimize this situation, we 
> could eagerly trigger a checkpoint after all sources are finished. 



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