BewareMyPower opened a new pull request, #19972:
URL: https://github.com/apache/pulsar/pull/19972
### Motivation
Sometimes when a remote cluster is deleted, the replication cursor might
still exist for some topics. In this case, creating producers or consumers on
these topics will fail.
Here is a log observed in a production environment:
> WARN org.apache.pulsar.broker.service.BrokerService - Replication or
> dedup check failed. Removing topic from topics list
> persistent://public/__kafka/__consumer_offsets-partition-40,
> java.util.concurrent.CompletionException: java.lang.RuntimeException:
> org.apache.pulsar.metadata.api.MetadataStoreException$NotFoundException:
> kop
If it happened, unloading the topic or restarting the broker could not help.
We have to remove the cursor manually.
### Modificatons
When initializing a `PersistentTopic`, if there is any replicator cursor
while the responding cluster does not exist, ignore the exception from
`addReplicationCluster`. Then, remove this "zombie" cursor.
### Verifications
`PersistentTopicTest#testCreateTopicWithZombieReplicatorCursor` is added to
verify `PersistentTopic#initialize` will succeed and the zombie replicator
cursor will be removed.
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