[jira] [Commented] (FLINK-21084) Allows tasks to report operator subtask finish state

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

    [ https://issues.apache.org/jira/browse/FLINK-21084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17271250#comment-17271250 ] 

Guowei Ma commented on FLINK-21084:
-----------------------------------

Currently a Task would decline the checkpoint if some operators in it are finished. Some operators (for example sink) depend on the `Checkpoint/Checkpoint Listener` even if its’ predecessor operators are closed.

However, the first phase of `Support Checkpoints After Tasks Finished` plans not to support this. After some offline discussion with [~gaoyunhaii] we would propose not to support this at first version. 

> Allows tasks to report operator subtask finish state
> ----------------------------------------------------
>
>                 Key: FLINK-21084
>                 URL: https://issues.apache.org/jira/browse/FLINK-21084
>             Project: Flink
>          Issue Type: Sub-task
>          Components: API / DataStream, Runtime / Checkpointing
>            Reporter: Yun Gao
>            Priority: Major
>
> Once an operator is fully finished (e.g., all its subtasks are finished) in one checkpoint, the state need to be recorded to skip the execution of this operator after recovery. Thus we should allow operators to report finished state so that CheckpointCoordinator could identify fully finished operators for each checkpoint.



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