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Return the pool type specified in the configuration, which must be set to either
org.apache.hadoop.hbase.util.PoolMap.PoolType#RoundRobin or
org.apache.hadoop.hbase.util.PoolMap.PoolType#ThreadLocal, otherwise default to the
former. For applications with many user threads, use a small round-robin pool. For applications
with few user threads, you may want to try using a thread-local pool. In any case, the number
of
org.apache.hadoop.hbase.ipc.RpcClient instances should not exceed the operating
system's hard limit on the number of connections.