[jira] [Created] (FLINK-32496) Sources with idleness and alignment always wait for alignment when part of multiple sources is idle

["haishui (Jira)" <ji...@apache.org>]

haishui created FLINK-32496:
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             Summary: 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: 1.17.1, 1.16.2
            Reporter: haishui


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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