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https://issues.apache.org/jira/browse/FLINK-21364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17283152#comment-17283152
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Steven Zhen Wu commented on FLINK-21364:
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cc [~sewen] [~jqin] [~thomasWeise]
> 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: Major
>
> 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`.
> ```
> public RequestSplitEvent(
> @Nullable String hostName,
> @Nullable Collection<String> finishedSplitIds)
> ```
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