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https://issues.apache.org/jira/browse/FLINK-39108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18119124#comment-18119124
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Martijn Visser commented on FLINK-39108:
----------------------------------------
Another occurrence on release-1.20, GHA nightly 2026-09-22 (Java 8, module
tests):
https://github.com/apache/flink/actions/runs/35677981924/job/106599309529
{code}
[ERROR]
org.apache.flink.test.checkpointing.CheckpointIntervalDuringBacklogITCase.testNoCheckpointDuringBacklog
-- Time elapsed: 1.271 s <<< FAILURE!
org.opentest4j.AssertionFailedError:
expected: 0
but was: 1
at
org.apache.flink.test.checkpointing.CheckpointIntervalDuringBacklogITCase.testNoCheckpointDuringBacklog(CheckpointIntervalDuringBacklogITCase.java:142)
{code}
The test was disabled on master in da75518e7cd, which release-2.3 inherited.
release-1.20 and release-2.2 never got that commit, so they still run it.
> CheckpointIntervalDuringBacklog is ignored for the first checkpoint
> -------------------------------------------------------------------
>
> Key: FLINK-39108
> URL: https://issues.apache.org/jira/browse/FLINK-39108
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing
> Affects Versions: 1.19.0, 1.20.0, 2.2.0
> Reporter: Roman Khachatryan
> Priority: Major
> Labels: pull-request-available
>
> After adjusting
> CheckpointIntervalDuringBacklogITCase.testNoCheckpointDuringBacklog, it fails
> reliably because at least the first checkpoint is triggered regardless of the
> configured checkpoint-interval-during-backlog.
> Related:
> https://github.com/apache/flink/pull/22931#pullrequestreview-3820270489
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