Thanks Jose Luis López for your insight here, would you mind to apply for a JIRA account then file a new JIRA to follow this issue? Please tell me your account name when you submit application, and I would like to approve it on time.
Best Regards, - He Xiaoqiao On Fri, Jul 31, 2026 at 3:36 PM Jose Luis López López <[email protected]> wrote: > While analyzing HDFS-17951, I found that many tests leak mini-cluster > instances (MiniDFSCluster, MiniQJMHACluster, MiniJournalCluster, > MiniRouterDFSCluster, MiniYARNCluster, MiniMRYarnCluster and variants). > > A static scan of the test sources — vetted by hand to remove false > positives such as clusters owned by harnesses or torn down through wrapper > objects — found 86 cases in ~60 files, in three categories: > A) 27 tests create a local cluster and never shut it down on any path. > > B) 38 tests shut the cluster down only on the happy path (no finally / > try-with-resources), so the cluster leaks exactly when the test fails. > > C) 21 classes hold a cluster in a field with no teardown in the class > or its superclasses. > > Impact: leaks stay within the class, but a leaked cluster keeps CI > resources under the remaining tests, and one failure can cascade into bogus > failures of later tests in the class.There is no impact on production, only > improvement for CI testing. > > Please open a JIRA for this, and I will be happy to contribute. > > Regards, > Jose Luis López >
