Zhen-hao commented on issue #11356:
URL: https://github.com/apache/pulsar/issues/11356#issuecomment-882402758
Even after updating the cluster name on the tenant and namespace level,
there are still problems on the producer client.
```
[2021-07-19 11:27:03,632] [ERROR]
[org.apache.pulsar.client.impl.ProducerImpl] [] [pulsar-client-io-1-1] -
[pairtime-test/projection_akka_journal_nt_cluster_run_7/User_UserLoggedIn]
[null] Failed to create producer:
org.apache.pulsar.broker.service.schema.exceptions.SchemaException: Error while
reading ledger - ledger=90 - operation=Failed to read entry - entry=0 caused
by org.apache.pulsar.broker.service.schema.exceptions.SchemaException: Error
while reading ledger - ledger=90 - operation=Failed to read entry - entry=0 {}
[2021-07-19 11:27:03,632] [WARN]
[org.apache.pulsar.client.impl.ConnectionHandler] [] [pulsar-client-io-1-1] -
[pairtime-test/projection_akka_journal_nt_cluster_run_7/User_UserLoggedIn]
[null] Could not get connection to broker:
org.apache.pulsar.broker.service.schema.exceptions.SchemaException: Error while
reading ledger - ledger=90 - operation=Failed to read entry - entry=0 caused
by org.apache.pulsar.broker.service.schema.exceptions.SchemaException: Error
while reading ledger - ledger=90 - operation=Failed to read entry - entry=0 --
Will try again in 51.103 s {}
```
It is really a disaster to change the cluster name of a running cluster. The
documentation should warn against that.
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