I found a system test failure in which `task.isClosed()` threw an NPE. This change simply catches that condition and initiates a rebalance to try and recover.
An alternative approach would be to track down the root cause if we really don't expect the task to be missing. ### Committer Checklist (excluded from commit message) - [ ] Verify design and implementation - [ ] Verify test coverage and CI build status - [ ] Verify documentation (including upgrade notes) [ Full content available at: https://github.com/apache/kafka/pull/5648 ] This message was relayed via gitbox.apache.org for [email protected]
