 Main class for a series of name-node benchmarks.
 * 
 * Each benchmark measures throughput and average execution time 
 * of a specific name-node operation, e.g. file creation or block reports.
 Main class for a series of name-node benchmarks.
 * 
 * Each benchmark measures throughput and average execution time 
 * of a specific name-node operation, e.g. file creation or block reports. | NNThroughputBenchmark.java