Zookeeper not starting "org.apache.zookeeper.server.quorum.QuorumPeer Unable to load database on disk "

You will find below error messages in zookeeper logs 

Solution: 

1. Shutdown the Zookeeper service if it is running on the problematic node(s) 

2. Move out (but do not delete) the contents of /zkdata/zookeeper/version-2/ (It's a custom location, it may vary from cluster to cluster) on the problematic node(s) 

3. Restart the Zookeeper service.

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