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https://issues.apache.org/jira/browse/FLINK-17918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17123385#comment-17123385
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Arvid Heise commented on FLINK-17918:
-------------------------------------
Yes, the root cause is {{LIMIT}} swallowing up some tail records because it saw
the first records two times effectively. Since LIMIT is used in many tests (I
guess for correctly working retract streams, but I haven't understood it
entirely), many tests are currently prone to fail.
On a side-note, I'd keep the change in my commit on the {{FailingDataSource}}
that fails after at least one element was checkpointed (ofc remove all timing
related changes). The current way effectively drains all records before
triggering the crash, which will hide quite a lot of failures like this one.
> Blink Jobs are loosing data on recovery
> ---------------------------------------
>
> Key: FLINK-17918
> URL: https://issues.apache.org/jira/browse/FLINK-17918
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing, Table SQL / Runtime
> Affects Versions: 1.11.0
> Reporter: Piotr Nowojski
> Priority: Blocker
> Fix For: 1.11.0
>
>
> After trying to enable unaligned checkpoints by default, a lot of Blink
> streaming SQL/Table API tests containing joins or set operations are throwing
> errors that are indicating we are loosing some data (full records, without
> deserialisation errors). Example errors:
> {noformat}
> [ERROR] Failures:
> [ERROR] JoinITCase.testFullJoinWithEqualPk:775 expected:<List(1,1, 2,2,
> 3,3, null,4, null,5)> but was:<List(2,2, 3,3, null,1, null,4, null,5)>
> [ERROR] JoinITCase.testStreamJoinWithSameRecord:391 expected:<List(1,1,1,1,
> 1,1,1,1, 2,2,2,2, 2,2,2,2, 3,3,3,3, 3,3,3,3, 4,4,4,4, 4,4,4,4, 5,5,5,5,
> 5,5,5,5)> but was:<List()>
> [ERROR] SemiAntiJoinStreamITCase.testAntiJoin:352 expected:<0> but was:<1>
> [ERROR] SetOperatorsITCase.testIntersect:55 expected:<MutableList(1,1,Hi,
> 2,2,Hello, 3,2,Hello world)> but was:<List()>
> [ERROR] JoinITCase.testJoinPushThroughJoin:1272 expected:<List(1,0,Hi,
> 2,1,Hello, 2,1,Hello world)> but was:<List(2,1,Hello, 2,1,Hello world)>
> {noformat}
>
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