Github user asavartsov commented on the issue:
https://github.com/apache/flink/pull/2061
This kind of check is might be useless and probably wouldn't fix the issue.
My debugging shows that the list `idsProcessedButNotAcknowledged` is null on
recovery, not checkpoints itself. This list is initialized in `open` method,
but somehow it doesn't get called in such scenario.
---
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 [email protected] or file a JIRA ticket
with INFRA.
---
