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

Question

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

Answer 1

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

Namenode stores meta-data i.e. number of blocks, their location, replicas. This meta-data is available in memory in the master for faster retrieval of data. NameNode maintains and manages the slave nodes, and assigns tasks to them. It regulates client’s access to files.

It also executes file system execution such as naming, closing, opening files/directories.

During Hadoop installation, framework determines NameNode based on the size of the cluster. Mostly we don’t need to upgrade the NameNode because it does not store the actual data. But it stores the metadata, so such requirement rarely arise.

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