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What are the main functions of Secondary NameNode?

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Main functions of Secondary NameNode are as follows:

1. FsImage: It stores a copy of FsImage file and EditLog.

2. NameNode crash: In case NameNode crashes, we can use Secondary NameNode's FsImage to recreate the NameNode.

 

3. Checkpoint: Secondary NameNode runs Checkpoint to confirm that data is not corrupt in HDFS.

4. Update: It periodically applies the updates from EditLog to FsImage file. In this way FsImage file on Secondary NameNode is kept up to date. This helps in saving time during NameNode restart.

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