lhotari commented on issue #25944:
URL: https://github.com/apache/pulsar/issues/25944#issuecomment-4634373176

   The storage backend for stateful functions requires that Zookeeper is used. 
By default, Pulsar standalone uses RocksDB.
   
   Does the problem reproduce if you start Pulsar standalone with this command?
   
   ```shell
   PULSAR_STANDALONE_USE_ZOOKEEPER=1 bin/pulsar standalone
   ```
   
   For running Pulsar standalone in docker `-e 
PULSAR_STANDALONE_USE_ZOOKEEPER=1` could be used.
   Previous data won't be usable after switching from RocksDB to Zookeeper for 
metadata storage. You might also need to delete the files in `data` when 
switching. (On docker, the data volume, if that's configured)
   


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