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Twister2's local test runner shares fixed worker ports and process-wide state between pipelines. Beam's parallel JUnit runner currently starts several validation methods at once, which can interfere during graph construction. This CI run failed in
DAGMutableGraph.nodes()before reaching the job timeout.Set
beam.validatesRunner.parallelThreads=1for the Twister2 batch validation task. This serializes itsValidatesRunnermethods while retaining the existing test selection and general test-thread setting.In an isolated container network, the default parallel run reproduced the same graph-iteration stack. The same selected pipeline and assertion cases passed with the new setting. Evaluated Gradle settings and live worker threads confirmed the change. The full scheduled suite and its timeout behavior remain unverified locally.