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https://issues.apache.org/jira/browse/FLINK-26334?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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realdengziqi updated FLINK-26334:
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Attachment: image-2022-03-04-11-37-10-035.png
> When timestamp - offset + windowSize < 0, elements cannot be assigned to the
> correct window
> -------------------------------------------------------------------------------------------
>
> Key: FLINK-26334
> URL: https://issues.apache.org/jira/browse/FLINK-26334
> Project: Flink
> Issue Type: Bug
> Components: API / DataStream
> Affects Versions: 1.15.0, 1.14.3
> Environment: flink version 1.14.3
> Reporter: realdengziqi
> Priority: Major
> Attachments: image-2022-03-04-11-28-26-616.png,
> image-2022-03-04-11-37-10-035.png
>
> Original Estimate: 16h
> Remaining Estimate: 16h
>
> h2. issue
> Hello!
> When we were studying the flink source code, we found that there was
> a problem with its algorithm for calculating the window start time. When
> timestamp - offset + windowSize < 0 , the element will be incorrectly
> allocated to a window with a WindowSize larger than its own timestamp.
> The problem is in
> _org.apache.flink.streaming.api.windowing.windows.TimeWindow_
>
> {code:java}
> public static long getWindowStartWithOffset(long timestamp, long offset, long
> windowSize) {
> return timestamp - (timestamp - offset + windowSize) % windowSize;
> } {code}
> _!image-2022-03-04-11-28-26-616.png|width=738,height=261!_
>
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