having problem "understanding" ondisk example without godoc etc

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having problem "understanding" ondisk example without godoc etc
i'm kind of confused about the pebbledb more because not sure whether the state is using the pebbledb or the diskkv is using. if there's separation of diskkv to use maybe boltdb or rocksdb will be better understood.

1. does it mean i only need to modify diskkv.go to do set / get / delete etc? coz now i'm not sure if my set will affect the raft log etc too.
2. trying to read godoc for diskkv.go but not available. possible to pls update? dragonboat-example#29