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Apache HDFS Hadoop Distributed File System Interview Questions
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What happens if the block on Hadoop HDFS is corrupted?

 47

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

 44

How NameNode tackle Datanode failures in HDFS?

 27

How is indexing done in Hadoop HDFS?

 34

How to perform the inter-cluster data copying work in HDFS?

 37

What are the main properties of hdfs-site.xml file?

 40

Describe HDFS Federation?

 32

What is active and passive NameNode in HDFS?

 142

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

 31

How data or file is read in Hadoop HDFS?

 33

How HDFS helps NameNode in scaling in Hadoop?

 44

What is Fault Tolerance in Hadoop HDFS?

 33

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

 44

What is a Block Scanner in HDFS?

 85

Differentiate HDFS & HBase?

 35

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Un-Answered Questions { Apache HDFS Hadoop Distributed File System }

Tell me two most commonly used commands in HDFS?

34

Explain what happens if, during the PUT operation, HDFS block is assigned a replication factor 1 instead of the default value 3?

36

What are the different file permissions in the HDFS for files or directory levels?

120

What is the procedure to create users in HDFS and how to allocate Quota to them?

30

Define data integrity? How does hdfs ensure data integrity of data blocks stored in hdfs?

42

Write command to copy a file from HDFS to linux(local).

46

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

27

What do you mean by the High Availability of a NameNode in Hadoop HDFS?

27

Explain the process that overwrites the replication factors in HDFS?

40

What do you mean by metadata in HDFS?

51

How to create directory in HDFS?

44

Explain how are file systems checked in hdfs?

30

Explain HDFS “Write once Read many” pattern?

28

How does hdfs give great throughput?

28

How HDFS helps NameNode in scaling in Hadoop?

44

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