Cassandra Errors

Cassandra Errors :-

code=2200 [Invalid query] message="User '' already exists"

Cause : It seems user/role which you are trying to create already exists. 

Fix : Provide different User/Role which is not present . 

Connection error: ('Unable to connect to any servers', {'node1': AuthenticationFailed('Remote end requires authentication.',)})

 Cause : You have enabled  PasswordAuthentication  and then you tring to connect to cassandra without password

Fix:   Use password based login to connect to cassandra

For more details  visit Securing Cassandra.