lujiwen edited a comment on pull request #11198:
URL: https://github.com/apache/pulsar/pull/11198#issuecomment-1017295037


   @merlimat I got a problem when I tried to upgrade my pulsar cluster from 
2.8.0 to 2.9.1, my existing zookeeper server cluster version is 3.5.5. However, 
the upgraded pulsar cluster failed to start, because of this exception _### 
**org.apache.zookeeper.KeeperException$UnimplementedException**_, the 
stacktrace is as followed:
   
   `022-01-20T17:20:32,455+0800 [main] ERROR 
org.apache.pulsar.broker.PulsarService - Failed to start Pulsar service: 
org.apache.zookeeper.KeeperException$UnimplementedException: KeeperErrorCode = 
Unimplemented for /
   org.apache.pulsar.metadata.api.MetadataStoreException: 
org.apache.zookeeper.KeeperException$UnimplementedException: KeeperErrorCode = 
Unimplemented for /
        at 
org.apache.pulsar.metadata.impl.ZKMetadataStore.<init>(ZKMetadataStore.java:89) 
~[org.apache.pulsar-pulsar-metadata-2.9.1.jar:2.9.1]
        at 
org.apache.pulsar.metadata.impl.MetadataStoreFactoryImpl.newInstance(MetadataStoreFactoryImpl.java:52)
 ~[org.apache.pulsar-pulsar-metadata-2.9.1.jar:2.9.1]
        at 
org.apache.pulsar.metadata.impl.MetadataStoreFactoryImpl.createExtended(MetadataStoreFactoryImpl.java:36)
 ~[org.apache.pulsar-pulsar-metadata-2.9.1.jar:2.9.1]
   `
   
   I looked into the source code. the above exception is thrown at zkc.addWatch 
in ZKMetadataStore. I guess that this method call forces me to upgrade my 
zookeeper to a more update to date version, maybe 3.6.3. right? I am wondering 
is there any problem with my cluster metadata when I migrate my data from the 
old zookeeper ?
   Thanks a lot!
   
   


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