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https://issues.apache.org/jira/browse/FLINK-39846?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martijn Visser updated FLINK-39846:
-----------------------------------
Fix Version/s: 2.4.0
> IPv6HostnamesITCase runs unconditionally and fails on AdaptiveScheduler after
> JUnit5 migration
> ----------------------------------------------------------------------------------------------
>
> Key: FLINK-39846
> URL: https://issues.apache.org/jira/browse/FLINK-39846
> Project: Flink
> Issue Type: Bug
> Components: Tests
> Reporter: Martijn Visser
> Assignee: Martijn Visser
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.4.0
>
>
> IPv6HostnamesITCase.testClusterWithIPv6host fails in the
> test_cron_adaptive_scheduler tests leg on master, every nightly since
> ~2026-04-15. It is a JUnit5-migration regression
> https://issues.apache.org/jira/browse/FLINK-39124
> The migration converted the JUnit4 @Rule MiniClusterWithClientResource(...
> .setConfiguration(getConfiguration()) ...) to a static @RegisterExtension
> MiniClusterExtension(...) with a hardcoded configuration, dropping the call
> to getConfiguration(). That method (a) bound the cluster to a local IPv6
> address and (b) skipped the test (AssumptionViolatedException / IPv6
> assumption) when no non-loopback IPv6 address is available. Post-migration
> getConfiguration() is dead code, so the test runs unconditionally and without
> IPv6 configuration, and fails under the AdaptiveScheduler because the job
> uses GlobalWindows.createWithEndOfStreamTrigger() (a blocking data exchange
> the AdaptiveScheduler does not support):
> {code:java}
> Caused by: java.lang.IllegalStateException: The adaptive scheduler supports
> pipelined data exchanges (violated by GlobalWindows ...).
> {code}
> The CI environment has no usable IPv6 address (confirmed: release-2.0/2.1,
> which still call getConfiguration(), skip the test and stay green; the same
> CI agents run both master and release builds). A secondary effect: on master
> the test no longer applies the IPv6 config at all, so it isn't testing IPv6
> hostnames anymore.
> Fix: resolve the IPv6 address once at class load, configure the MiniCluster
> with it when present, self-skip when absent (restoring pre-migration
> behavior), and add @Tag(FailsWithAdaptiveScheduler) so it is also excluded
> from the adaptive profile when IPv6 is present.
> Build:
> https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=75618
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