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Answer Posted / Richa Gupta
The main HDFS daemons in a Hadoop cluster are: 1. NameNode: It manages the file system namespace, regulates access to files, and maintains the metadata for all files in the file system. 2. Secondary NameNode: It performs housekeeping tasks like checkpointing the NameNode's memory structure, which helps to recover from a crash or system failure. 3. DataNode: It stores the actual data blocks of the files in HDFS and handles read and write requests from clients. 4. JournalNode: It maintains the journal file that logs all changes made to the file system namespace.
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