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Answer Posted / Bipin Kumar Singh
In HDFS, there are two types of NameNodes: Active NameNode and Standby (Passive) NameNode. The Active NameNode manages the entire namespace and handles client requests. It maintains the FileSystem image, which stores all metadata about files and directories in the HDFS cluster. The Passive NameNode is used for high availability. It synchronizes with the Active NameNode, and in case of a failure, it can take over as the new Active NameNode.
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