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https://issues.apache.org/jira/browse/FLINK-40009?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martijn Visser resolved FLINK-40009.
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Fix Version/s: 2.4.0
Resolution: Fixed
Fixed in apache/flink:master 1268adfdb03ff9dca2ce53a224974db6918b66d5
> RescaleTimelineITCase.waitUntilConditionWithTimeout never enforces its
> timeout on a ForkJoinPool worker
> -------------------------------------------------------------------------------------------------------
>
> Key: FLINK-40009
> URL: https://issues.apache.org/jira/browse/FLINK-40009
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Coordination, Tests
> Affects Versions: 2.4.0
> Reporter: Martijn Visser
> Assignee: Martijn Visser
> Priority: Major
> Labels: pull-request-available, test-stability
> Fix For: 2.4.0
>
>
> RescaleTimelineITCase can hang until the CI watchdog kills the fork. A thread
> dump
> from build 76242 showed waitUntilConditionWithTimeout still parked after 978s
> on a
> 20s budget.
> https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=76242&view=results
> (leg: test_cron_jdk11 core)
> Root cause: {{waitUntilConditionWithTimeout}} wrapped an unbounded
> {{CommonTestUtils#waitUntilCondition}} in {{CompletableFuture#runAsync}} and
> bounded it with {{get(timeout)}}. On JDK 11, when the test runs on a
> ForkJoinPool worker (JUnit 5's test executor), {{CompletableFuture#timedGet}}
> help-executes the async task inline via {{ForkJoinPool#helpAsyncBlocker}}, so
> the never-ending poll loop runs on the waiting thread and the timeout never
> fires; the fork hangs until the CI watchdog kills it. A thread dump from
> build 76242 (the {{test_cron_jdk11}} leg) showed the call parked after 978s
> on a 20s budget. JDK 17 and 21 changed {{helpAsyncBlocker}} and do not
> exhibit the hang, which is why only the JDK 11 cron leg caught it.
> Fix: poll synchronously on the calling thread via
> {{CommonTestUtils#waitUtil}}, so the timeout is always enforced and no task
> is leaked into the common pool.
> Related: FLINK-39902, FLINK-39903 (same test class).
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