[jira] [Created] (FLINK-21364) piggyback finishedSplitIds in RequestSplitEvent

["Steven Zhen Wu (Jira)" <ji...@apache.org>]

Steven Zhen Wu created FLINK-21364:
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             Summary: 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


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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