Trace: • name_node

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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

When proccess of Reboot or Checkpoint the fsImage marges with Edit log to fsImage

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

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