Github user rmetzger commented on the pull request: https://github.com/apache/flink/pull/750#issuecomment-139194317 > The cancel only sets an internal variable. That is probably true for all sources that Flink provides. But the interface for sources is a public API, and trusting that users are implementing this properly is dangerous. It can basically lock the entire Flink cluster.
--- 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. ---