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Apache HDFS Hadoop Distributed File System Interview Questions
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Explain the hdfs architecture?

 45

How does hdfs provides good throughput?

 42

Can we have different replication factor of the existing files in hdfs?

 46

How will you perform the inter cluster data copying work in hdfs?

 27

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?

 117

List the files associated with metadata in hdfs?

 26

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

 42

What is a rack awareness algorithm and why is it used in hadoop?

 27

What is a block?

 44

What is throughput? How does hdfs provides good throughput?

 52

Replication causes data redundancy and consume a lot of space, then why is it pursued in hdfs?

 35

Define hadoop archives? What is the command for archiving a group of files in hdfs.

 27

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

 22

What is the difference between nas (network attached storage) and hdfs?

 43

What is a rack awareness algorithm?

 52

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

What do you mean by metadata in HDFS?

51

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

44

What do you mean by metadata in Hadoop?

32

What is HDFS?

33

What is the benifit of Distributed cache, why can we just have the file in HDFS and have the application read it?

40

Can multiple clients write into a Hadoop HDFS file concurrently?

41

Can we change the document present in hdfs?

27

What is the difference between Input Split and an HDFS Block?

63

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

28

What is Hadoop Distributed File System- HDFS?

37

In HDFS, how Name node determines which data node to write on?

46

How to remove safemode of namenode forcefully in HDFS?

32

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

41

What happens when two clients try to access the same file on HDFS?

154

What is Block in HDFS?

34

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