How to find number of nodes in Hadoop cluster?

Question

Can anyone tell me how to find the number of nodes in the Hadoop cluster?

Answer 1

Here is the simple formula to find the number of nodes in Hadoop Cluster?

N = H / D

where N = Number of nodes

             H = HDFS storage size

             D = Disk space available per node

Consider you have 400 TB of the file to keep in Hadoop Cluster and the disk size is 2TB per node.  The number of nodes required is calculated as

Number of nodes required = 400/2 = 200.

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