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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
- Edit log - (aka Journal) Track any client changes of information
- When proccess of Reboot or Checkpoint the Map marges with Edit log to fsImage
To keep presistnece of the data on hard drive the Edit log marges with Map
