Answer / 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.

Which one is the master node in HDFS? Can it be commodity hardware?

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Why rack awareness algorithm is used in hadoop?

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What is a block in HDFS, why block size 64MB?

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What do you mean by metadata in HDFS?

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What is the difference between an input split and hdfs block?

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Compare hbase vs hdfs?

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What do you mean by the high availability of a namenode?

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How to Delete directory and files recursively from HDFS?

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How does HDFS ensure Data Integrity of data blocks stored in HDFS?

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Does the HDFS go wrong? If so, how?

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What is a block?

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What alternate way does HDFS provides to recover data in case a Namenode, without backup, fails and cannot be recovered?

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