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https://issues.apache.org/jira/browse/FLINK-15343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17008685#comment-17008685
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Aljoscha Krettek commented on FLINK-15343:
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One alternative to this is that users can just override
{{processWatermark1/2()}} and implement their own logic. I'm skeptical about
adding additional checks and a new option in there if there is an easy
workaround.
> Add Watermarks options for TwoInputStreamOperator
> -------------------------------------------------
>
> Key: FLINK-15343
> URL: https://issues.apache.org/jira/browse/FLINK-15343
> Project: Flink
> Issue Type: Improvement
> Reporter: jocean.shi
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Currently, The "TwoInputStreamOperator" such as
> "CoBroadcastWithKeyedOperator" "KeyedCoProcessOperator" and the
> (Co)stream such as "ConnectedStreams" "BroadcastConnectedStream" only
> support compute watermark by two stream.
> but user just need one stream to compute watermark in some case.
> For example: one stream is only rule data or control command, it
> don't hava event time.
> I think user has right to choose which stream to compute watermark.
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