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Apache HDFS Hadoop Distributed File System Interview Questions
Questions Answers Views Company eMail

What is the module in HDFS?

 40

Tell me two most commonly used commands in HDFS?

 38

What is a block in HDFS? what is the default size in Hadoop 1 and Hadoop 2? Can we change the block size?

 64

HDFS is used for applications with large data sets, not why Many small files?

 38

What is throughput? How does HDFS provide good throughput?

 30

File permissions in HDFS?

 31

What is Hadoop HDFS – Hadoop Distributed File System?

 40

How to change the replication factor of data which is already stored in HDFS?

 39

What is Block in HDFS?

 47

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

 38

Can multiple clients write into an HDFS file concurrently?

 65

Why is block size set to 128 MB in Hadoop HDFS?

 107

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

 41

How HDFS client divide the file into the block while storing inside HDFS?

 64

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

 72

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

What is the throughput?

47

What are the difference between of the “HDFS Block” and “Input Split”?

70

Difference Between Hadoop and HDFS?

64

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

61

What is the difference between MapReduce engine and HDFS cluster?

100

How to create Users in hadoop HDFS?

80

How data or a file is written into hdfs?

52

Which classes are used by the hive to read and write hdfs files?

72

How are file systems checked in hdfs?

25

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

50

What are the main features of hdfssite.xml?

31

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

35

What happens when two users try to access to the same file in HDFS?

79

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

37

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

72

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