1.

Explain the functions of Secondary NameNode?

Answer»

The various functions of SECONDARY NameNode are as follows.

  • FsImage: It is used for storing a copy of FsImage file and EDITLOG.
  • CHECKPOINT: In HDFS, Checkpoint is used by Secondary NameNode in order to detect any CORRUPTED data present.
  • NameNode CRASH: Secondary NameNode’s FsImage can be used for the purpose of recreating the NameNode in case of any NameNode crash.
  • Update: It helps to keep the FsImage file updated on Secondary NameNode. It updates both FsImage file and EditLog automatically.


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