poorbarcode opened a new pull request, #23360:
URL: https://github.com/apache/pulsar/pull/23360
### Motivation
#### Background
- Users may start 2 clusters with the Geo-Replication feature with Global ZK
- Users want to hire one cluster, so remove the cluster from
`namespace-level replicatedClusters`
- Broker will remove the topics of the cluster removed automatically.
- Issue occurs:
- The system topic `__change_events` being deleted first.
- User topics can not be deleted anymore, because the operation `delete
topic-level policies` can not be executed successfully anymore.
- The task `topic.checkReplication` and other operations will retry again
and again, as a result, the broker will crash of OOM
### Modifications
- Skip removing topic-level policies if the system topic `__change_event`
has been deleted.
### Documentation
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- [ ] `doc` <!-- Your PR contains doc changes. -->
- [ ] `doc-required` <!-- Your PR changes impact docs and you will update
later -->
- [x] `doc-not-needed` <!-- Your PR changes do not impact docs -->
- [ ] `doc-complete` <!-- Docs have been already added -->
### Matching PR in forked repository
PR in forked repository: x
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