Posted On: Feb 22, 2018
Name-Node Metadata stores the record for Block mapping, locations of blocks on DataNodes, dynamic data nodes, and much more metadata are altogether stored in memory on the Name-Node. When we check the Name-Node status site, basically the greater part of that data is kept in memory somewhere.
The main thing stored on disk is the fsimage, edit log, and status logs. Name-Node never truly utilizes these records on disk, aside from when it begins. The fsimage and edits record practically exist to have the capacity to bring the Name-Node back up if it should be halted or it crashes.
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