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Asked: 2026-05-19T05:20:30+00:00

I am setting up a single node install of Cassandra on my Ubuntu VM.

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I am setting up a single node install of Cassandra on my Ubuntu VM. I modified the cassandra.yaml file under /cassandra/conf with my own custom schema. When I tried using the schematool utility under /cassandra/bin, I got the error:

Cannot import schema when one already
exists

When I tried navigating to the MBEAN loadSchemaFromYAML from the JMX console:

Problem invoking loadSchemaFromYAML:
java.rmi.unmarshalexception:Error
Unmarshalling return;nested exception
is:
Java.lang.ClassNotFoundException:org.apache.cassandra.config.ConfigurationException(no
security manager:RMI class loader
disabled)

Can somebody point out what is going on over here and how do I get my schema loaded?

Thanks

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1 Answer

  1. Editorial Team

    You can only import the schema from cassandra.yaml one time. (This is now deprecated, by the way.) If you want to import the schema from cassandra.yaml again, you’ll need to wipe out your data directories (/var/lib/cassandra/*) and restart Cassandra.

    Your other option (and what you will need to do in the future) is create the keyspaces and column families using bin/cassandra-cli or another client.

    Here’s an article on live schema modifications to get you started.

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