HDFS - EditLog (transaction log)

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1 - About

The NameNode uses a transaction log called the EditLog to persistently record every change that occurs to file system metadata.

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3 - Example

The NameNode to insert a record into the EditLog when

  • a new file is created
  • the replication factor of a file is changed

4 - Management

4.1 - Offline Edits Viewer

Offline Edits Viewer is a tool to parse the Edits log file.

4.2 - Location

The NameNode uses a file in its local host OS file system to store the EditLog.