Answer / Manju Singh

High Availability (HA) of a NameNode in Hadoop HDFS refers to the capability of the system to maintain its functionality even when the Active NameNode fails. This is achieved through the use of two NameNodes: the Active NameNode, responsible for handling client requests and managing the filesystem, and the Standby NameNode, which monitors the Active NameNode's health and can take over in case of failure. The HA configuration ensures that the system remains functional with minimal data loss.

What is HDFS?

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Hdfs stores data using commodity hardware which has higher chances of failures. So, how hdfs ensures the fault tolerance capability of the system?

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If the source data gets updated every now and then, how will you synchronize the data in hdfs that is imported by sqoop?

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How would you import data from MYSQL into HDFS ?

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What is secondary namenode? Is it a substitute or back up node for the namenode?

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Mention what is the difference between hdfs and nas?

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Does the HDFS go wrong? If so, how?

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Why rack awareness algorithm is used in hadoop?

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What do you mean by metadata in HDFS? Where is it stored in Hadoop?

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How to create directory in HDFS?

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Why HDFS performs replication, although it results in data redundancy in Hadoop?

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Difference Between Hadoop and HDFS?

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