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https://issues.apache.org/jira/browse/FLINK-21364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17501528#comment-17501528
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Steven Zhen Wu commented on FLINK-21364:
----------------------------------------

[~jqin] [~thw] [~pnowojski] I like to restart this discussion. Besides the 
proposal in this PR, we can also go with the other approach that Thomas 
mentioned where we create a separate `FinishedSplitsEvent`. Please let me know 
your thoughts.

> piggyback finishedSplitIds in RequestSplitEvent
> -----------------------------------------------
>
>                 Key: FLINK-21364
>                 URL: https://issues.apache.org/jira/browse/FLINK-21364
>             Project: Flink
>          Issue Type: Improvement
>          Components: Connectors / Common
>    Affects Versions: 1.12.1
>            Reporter: Steven Zhen Wu
>            Priority: Minor
>              Labels: auto-deprioritized-major, pull-request-available
>
> For some split assignment strategy, the enumerator/assigner needs to track 
> the completed splits to advance watermark for event time alignment or rough 
> ordering. Right now, `RequestSplitEvent` for FLIP-27 source doesn't support 
> pass-along of the `finishedSplitIds` info and hence we have to create our own 
> custom source event type for Iceberg source. 
> Here is the proposal of add such optional info to `RequestSplitEvent`.
> {code}
> public RequestSplitEvent(
>     @Nullable String hostName, 
>     @Nullable Collection<String> finishedSplitIds)
> {code}



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