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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

Contains

  • Map - Snapshot of entire file system (in Memory)
  • Edit log - Track any client changes of information
  • When proccess of Reboot or Checkpoint the Map marges with Edit logs to fsImage

To keep presistnece of the data on hard drive the Edit log marges with Map

learn/bigdata/name_node.1407431324.txt.gz · Last modified: (external edit)
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