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Apache HDFS Hadoop Distributed File System Interview Questions
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What is the module in HDFS?

 23

Tell me two most commonly used commands in HDFS?

 30

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

 46

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

 22

What is throughput? How does HDFS provide good throughput?

 24

File permissions in HDFS?

 17

What is Hadoop HDFS – Hadoop Distributed File System?

 24

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

 23

What is Block in HDFS?

 28

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

 23

Can multiple clients write into an HDFS file concurrently?

 36

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

 36

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

 26

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

 50

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

 50

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

Explain the difference between nas and hdfs?

24

What is non-dfs used in hdfs web console

38

Hdfs stores data using commodity hardware which has higher chances of failures. So, how hdfs ensures the fault tolerance capability of the system?

14

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

36

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

33




How to transfer data from Hive to HDFS?

26

What is active and passive NameNode in HDFS?

88

What is the throughput?

31

How does a client read/write data in HDFS?

24

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

38

What is secondary namenode?

30

What are file permissions in HDFS and how HDFS check permissions for files or directory?

26

When NameNode enter in Safe Mode?

25

Can multiple clients write into an HDFS file concurrently?

36

Is the hdfs block size reduced to achieve faster query results?

26

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