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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?

46

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 }

How is NFS different from HDFS?

49


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

37


How HDFS helps NameNode in scaling in Hadoop?

58


When NameNode enter in Safe Mode?

38


What is the throughput? How does hdfs give great throughput?

58


What is the difference between an hdfs block and input split?

74


Define hadoop archives?

27


Why is block size large in Hadoop?

56


Explain NameNode and DataNode in HDFS?

51


What is the difference between MapReduce engine and HDFS cluster?

100


How data or file is read in HDFS?

38


What is the importance of dfs.namenode.name.dir in HDFS?

58


How to Delete directory from HDFS?

42


How does a client read/write data in HDFS?

41


Can you define a block and block scanner in hdfs?

49