GitHub user NicoK opened a pull request: https://github.com/apache/flink/pull/4464
[FLINK-7354][tests] ignore "initialSeedUniquifierGenerator" thread in thread list ## What is the purpose of the change Netty may spawn a thread in its `ThreadLocalRandom` because of some secure random use which may be caught in our `LocalFlinkMiniClusterITCase` thread check as being started but not stopped by us. We can simply ignore this thread and solve the test instability. Alternatively, we could solve this similarly to https://issues.apache.org/jira/browse/SOLR-10098 by setting `ThreadLocalRandom.setInitialSeedUniquifier(1L);` but that may be less future proof or even remove some randomness. ## Brief change log - ignore any spawned thread with prefix `"initialSeedUniquifierGenerator"` ## Verifying this change This change is a trivial rework / code cleanup without any test coverage. ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (no) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (no) - The serializers: (no) - The runtime per-record code paths (performance sensitive): (no) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no) ## Documentation - Does this pull request introduce a new feature? (no) - If yes, how is the feature documented? (not applicable) You can merge this pull request into a Git repository by running: $ git pull https://github.com/NicoK/flink flink-7354 Alternatively you can review and apply these changes as the patch at: https://github.com/apache/flink/pull/4464.patch To close this pull request, make a commit to your master/trunk branch with (at least) the following in the commit message: This closes #4464 ---- commit 4a26f37bbffa70e848bc0fdd80b91d5c601b4ce6 Author: Nico Kruber <n...@data-artisans.com> Date: 2017-08-02T14:20:02Z [FLINK-7354][tests] ignore "initialSeedUniquifierGenerator" thread in thread list Netty may spawn a thread in its ThreadLocalRandom class because of some secure random use which may be caught in our LocalFlinkMiniClusterITCase as not being stopped. Let's tolerate this. Alternatively, we could solve this similarly to https://issues.apache.org/jira/browse/SOLR-10098 by setting ThreadLocalRandom.setInitialSeedUniquifier(1L); but that may be less future proof or even remove some randomness. ---- --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---