What is JournalNode

Maintains a directory to log the modifications to the Namespace metadata when using the Quorum-based Storage mechanism for providing High Availability. In the event of a failover, the NameNode standby will ensure that it has applied all of the edits from the JournalNodes before promoting itself to the active state.

Other related questions:
What is AS
What is HCNA
What is a tracker
What is an ATS?
What Is Workspace?
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