Answer / Awanish Kumar Jaiswal

A block in HDFS is the smallest unit of data that can be written to or read from the file system. The default block size in Hadoop 1 is 64MB, while in Hadoop 2 it's 128MB. Yes, you can change the block size according to your requirements.

What is hdfs block size?

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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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How one can format Hadoop HDFS?

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Mention what is the difference between hdfs and nas?

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Explain the process that overwrites the replication factors in HDFS?

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Explain NameNode and DataNode in HDFS?

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how does hdfs ensure data integrity of data blocks stored in hadoop hdfs?

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Since the data is replicated thrice in hdfs, does it mean that any calculation done on one node will also be replicated on the other two?

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Can multiple clients write into a Hadoop HDFS file concurrently?

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

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What do you mean by the high availability of a namenode? How is it achieved?

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Define HDFS and talk about their respective components?

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