What is backupnode in hadoop

Backup Node in Hadoop 2

Backup Node: Backup Node in hadoop is an extended checkpoint node that performs checkpointing and also supports online streaming of file system edits. The advantage over the checkpoint node is that the namespace (meta-data) present in it’s main memory is always in sync with primary namenode file system namespace, Since it maintains an in-memory, up-to-date copy of file system namespace and accepts a real time online stream of file system […]

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I am a plsql developer. Intrested to move into bigdata.

Neetika Singh ITA