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Version 1 of meta.properties adds the controller.id field.  Nodes which are acting as controllers will have this field.  If the node is also a broker, it will have the broker.id field as well.

During broker startup, if each directory does not have a broker.id, one will be added with the current broker id.  Similarly, during controller startup, if each directory does not have a controller id, one will be added with the current controller id.  If the broker id and/or controller id is present but does not match the configured id, the directory will be considered failed and will not be included in the valid storage directories of the process.

Here is an example of a version 1 meta.properties file:

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