ODL Notes
ODL clustering has no notion of discovery. There is a flat file (akka.conf) on each VM that contains info about its peers.
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ODL clustering was designed for high availability really - not for scaling. So that's why it doesn’t address scaling in any real way. There are some improvements in clustering planned for the next ODL release (Oxygen), the details for the improvements are not yet known.
ConfigScaleOut API Definition
Information on the ConfigScaleOut can be found on readthedocs: