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Table of Contents
Name node
MOST IMPORATANT FOR CLUSTER! - in-memory location of every Data block in cluster / rack
- Controlls DataNodes
- FS Ops
- Block Mapping
Requriements
- Should have LOT OF RAM, LOT OF MEM, LOT OF POWER
Structure
- RAM
- FILE
When proccess of Reboot or Checkpoint the RAM\fsImage marges with Edit log to FILE\fsImage file
To keep presistnece of the data on hard drive the Edit log marges with Map
