What do you mean by Meta information in HDFS? List the documents related to metadata.

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.

• 1) fsimage – An fsimage document contains the entire state of the file system at a point in time. Each document system modification is doled out in a unique process, monotonically expanding transaction ID. A fsimage document speaks to the file system state after all alterations up to a particular transaction ID.
• 2) Edits – An edited file is a log that lists each document system change (record creation, deletion or alteration) that was made after the latest fsimage. When a document is put into HDFS, it is converted into blocks (of configurable size).