Martijn Visser created FLINK-39846:
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Summary: 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
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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