I found this video by the CTO of MapR to be very explanatory about now Mapr does things.
In short, there are no NameNodes to die in your Hadoop cluster, their MaprDB seems even better than HBase, their NFS allows for random read-write, and everything on the cluster is HA (not sure still why exactly there are a limited number of control nodes though – more to learn).
https://www.mapr.com/resources/videos/architectural-overview-mapr
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