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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 we will throw an exception and abort the startup process.

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

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