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In version 0 of meta.properties, the cluster.id field is optional.  In contrast, in version 1 it is mandatory.

In version 0 of meta.properties, the cluster.id field is serialized in hexadecimal.  In contrast, in version 1 it is serialized in base64.

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.

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$ cat /tmp/kafka-logs/meta.properties
#
#Tue Dec 01 10:08:08 PST 2020
cluster.id=51380268-1036-410d-a8fc-fb3b55f480333Db5QLSqSZieL3rJBUUegA
version=1
broker.id=0

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