The MapR RPC layer in the client multiplexes all requests to a given MFS server (such as, requests across files, tables, and streams) on the socket that is already open. Thus, a large number of connections is not (usually) an issue since connections are multiplexed down to the reused sockets for each client-server pair. Since socket use is very efficient, there's no need to be concerned about a client opening multiple “connections” at the same time.
At a peak, if a client touches all servers in the cluster, it (theoretically) could open one socket to every server in the cluster.
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