Answer / Arvind Kumar Sinha

Inter-cluster data copying in HDFS can be achieved using DistCP or Data Transfer Protocol (DTP). DistCP is a distributed file copy utility for Hadoop, while DTP allows high-speed transfer of large amounts of data between HDFS clusters.

Does HDFS allow a client to read a file which is already opened for writing in hadoop?

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What are problems with small files and hdfs?

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What do you mean by metadata in HDFS?

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What is NameNode and DataNode in 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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Suppose there is file of size 514 mb stored in hdfs (hadoop 2.x) using default block size configuration and default replication factor. Then, how many blocks will be created in total and what will be the size of each block?

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Explain how are file systems checked in hdfs?

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List the files associated with metadata in hdfs?

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Can multiple clients write into an HDFS file concurrently?

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Explain NameNode and DataNode in HDFS?

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Distinguish HDFS Block and Input Unit?

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Why is HDFS only suitable for large data sets and not the correct tool to use for many small files?

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