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https://issues.apache.org/jira/browse/FLINK-23283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17376322#comment-17376322
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JING ZHANG edited comment on FLINK-23283 at 7/7/21, 6:21 AM:
-------------------------------------------------------------

[~xintongsong] The unstable case is caused by whether the last two records 
dropped as late data is nonderterministic. It depends on the watermark on 
current task which is relates to parallelism and what data is processed on each 
concurrent task.

And

`GroupWindowITCase#testWindowAggregateOnUpsertSourcePushdownWatermark` has 
similar problems, I would set parallelism to 1 for those two cases to avoid 
unstable failure.


was (Author: qingru zhang):
[~xintongsong] The unstable case caused by whether the last two records dropped 
as late data depends on the watermark on current task which is 
nonderterministic which depends on parallelism and what data is processed on 
each concurrent task.

I would set parallelism to 1 for those two cases to avoid unstable failure.

> GroupWindowITCase.testWindowAggregateOnUpsertSource fails on azure
> ------------------------------------------------------------------
>
>                 Key: FLINK-23283
>                 URL: https://issues.apache.org/jira/browse/FLINK-23283
>             Project: Flink
>          Issue Type: Bug
>          Components: Table SQL / Planner
>    Affects Versions: 1.14.0
>            Reporter: Roman Khachatryan
>            Assignee: JING ZHANG
>            Priority: Blocker
>             Fix For: 1.14.0
>
>
> https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=19978&view=logs&j=e25d5e7e-2a9c-5589-4940-0b638d75a414&t=a6e0f756-5bb9-5ea8-a468-5f60db442a29&l=7086
> {code}
> 2021-07-06T10:13:10.6091443Z Jul 06 10:13:10 [ERROR] Tests run: 48, Failures: 
> 1, Errors: 0, Skipped: 0, Time elapsed: 14.945 s <<< FAILURE! - in 
> org.apache.flink.table.planner.runtime.stream.sql.GroupWindowITCase
> 2021-07-06T10:13:10.6093667Z Jul 06 10:13:10 [ERROR] 
> testWindowAggregateOnUpsertSource[StateBackend=HEAP, UseTimestampLtz = 
> false](org.apache.flin*k.table.planner.runtime.stream.sql.GroupWindowITCase)  
> Time elapsed: 0.329 s  <<< FAILURE!
> 2021-07-06T10:13:10.6096965Z Jul 06 10:13:10 java.lang.AssertionError: 
> expected:<List(Euro,1,118,1970-01-01T00:00:15,1970-01-01T00:00:20, US Dolla 
> r,1,102,1970-01-01T00:00,1970-01-01T00:00:05, 
> Yen,1,1,1970-01-01T00:00,1970-01-01T00:00:05)> but 
> was:<List(Euro,1,118,1970-01-01T00:00:15,1970-01- 01T00:00:20, US 
> Dollar,1,104,1970-01-01T00:00,1970-01-01T00:00:05, 
> Yen,1,1,1970-01-01T00:00,1970-01-01T00:00:05)>
> 2021-07-06T10:13:10.6098985Z Jul 06 10:13:10    at 
> org.junit.Assert.fail(Assert.java:89)
> 2021-07-06T10:13:10.6099695Z Jul 06 10:13:10    at 
> org.junit.Assert.failNotEquals(Assert.java:835)
> 2021-07-06T10:13:10.6100489Z Jul 06 10:13:10    at 
> org.junit.Assert.assertEquals(Assert.java:120)
> 2021-07-06T10:13:10.6101292Z Jul 06 10:13:10    at 
> org.junit.Assert.assertEquals(Assert.java:146)
> 2021-07-06T10:13:10.6102395Z Jul 06 10:13:10    at 
> org.apache.flink.table.planner.runtime.stream.sql.GroupWindowITCase.testWindowAggregateOnUpsert*Source(GroupWindowITCase.scala:421)
> {code}
> Fails locally 3 times out of 1000



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