If DataNode increases, then do we need to upgrade NameNode?

[DataFlair Team]

If DataNode increases, then do we need to upgrade NameNode in HDFS?

[DataFlair Team]

The answer to this question is relative.
The ideal situation for the cluster is that the NameNode Should be of high specification in terms of RAM as it stores the metadata about the DataNode in-memory.
The DataNode should be high specs in terms of Disk space as it stores the actual data.

It depends how much datanodes you are adding. Suppose your cluster has 100 data nodes and you are horizontally scaling the cluster with 5 Data Nodes then the upgrade of NameNode is not required, but if you are scaling 50 Nodes then the NameNode will be serving a lot of extra request and hence the upgrade would be required,

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