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.
These Big Data Hadoop interview questions are the selected ones which are asked frequently and by going through these HDFS interview questions you will be able to answer many other related answers in your interview.
We have categorized the above Big Data Hadoop interview questions and answers for HDFS Interview for freshers and experienced.