[GitHub] [pulsar] dik111 commented on pull request #11198: Use ZK persistent watches

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dik111 commented on pull request #11198:
URL: https://github.com/apache/pulsar/pull/11198#issuecomment-1041617332


   > @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!
   
   I have encountered the same mistake


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