Github user vanzin commented on the pull request: https://github.com/apache/spark/pull/1387#issuecomment-49072342 Just as a thought exercise: what if you change `ContextCleaner.stop()` to interrupt the cleaning thread, wait for it to finish, and then manually clean all buffered references that haven't been cleaned yet?
--- 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. ---