Answer / 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.

Can you explain about the indexing process in hdfs?

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Why HDFS stores data using commodity hardware despite the higher chance of failures in hadoop?

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Define HDFS and talk about their respective components?

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What is the difference between namenode, backup node and checkpoint namenode?

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What are tools available to send the streaming data to hdfs?

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How to transfer data from Hive to HDFS?

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Explain the key features of hdfs?

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How can one copy a file into HDFS with a different block size to that of existing block size configuration?

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Why does hive not store metadata information in hdfs?

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