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https://issues.apache.org/jira/browse/FLINK-32496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17738933#comment-17738933
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Martijn Visser commented on FLINK-32496:
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Thanks for checking and following up!
> Sources with idleness and alignment always wait for alignment when part of
> multiple sources is idle
> ---------------------------------------------------------------------------------------------------
>
> Key: FLINK-32496
> URL: https://issues.apache.org/jira/browse/FLINK-32496
> Project: Flink
> Issue Type: Bug
> Components: API / DataStream
> Affects Versions: 1.16.2, 1.17.1
> Reporter: haishui
> Assignee: Rui Fan
> Priority: Major
>
> Sources with idleness and alignment always wait for alignment when part of
> multiple sources is idle.
> *Root cause:*
> In
> [SourceOperator|https://github.com/apache/flink/blob/master/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/SourceOperator.java],
> `lastEmittedWatermark` is Long.MAX_VALUE if a source is idle.
> When other source is active, the `currentMaxDesiredWatermark` is less then
> Long.MAX_VALUE.
> So the `shouldWaitForAlignment` method is always true for idle sources.
>
> What's more, the source will become idle if a source wait for alignment for a
> long time, which also should be considered.
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