I met the same issue described in Getting No CLDB entries, cannot run, even zookeeper, warden and CLDB is running.
Following the steps in the answer doesn't solve my issue. The error below shows in the file /opt/mapr/logs/cldb.log
2018-01-09 06:40:55,372 INFO FileServerHandler [RPC-3]: FSRegister: Registered FileServer: 10.1.2.57- at topology /default-rack/maprdemo/5660
2018-01-09 06:40:55,374 INFO FileServerHandler [RPC-3]: FileServer Registration Request: Node Configuration
2018-01-09 06:40:55,374 INFO FileServerHandler [RPC-3]: NumCpus: 2 Avail Memory: 877 Num Sps: 0 Num Instances: 1
2018-01-09 06:41:53,653 INFO CLDBServer [Lookup-2]: Rejecting RPC 2345.5 from 10.1.2.57:40599 with status 3 as CLDB is waiting for local kvstore to become master.
My environment is a single-node Mapr cluster.