Top 50+ HDFS Interview Questions and Answers 1


Objective

Hadoop distributed file system (HDFS) is a system that stores very large dataset. As it is the most important component of Hadoop Architecture so it is the most important topic for an interview. In this blog, we provide the 50+ HDFS interview questions and answers that are being framed by our company expert who provides training in Hadoop and another Bigdata framework. A Proper care has been taken while answering these questions. So we can provide you the best question and their answer. Hope these question will help you to crack Hadoop interview. All the best!!!!!!!

Lost Of  50+ Top HDFS interview Questions and Answers for Hadoop Interview.

50+ Best HDFS Interview Questions And Answers

1) What is Hadoop?

View Answer >>

2) What is Hadoop Distributed File System- HDFS?

View Answer >>

3) What is NameNode and DataNode in HDFS?

View Answer >>

4) How NameNode tackle Datanode failures in HDFS?

View Answer >>

5) What do you mean by metadata in Hadoop?

View Answer >>

6) In which location NameNode stores its Metadata? And why?

View Answer >>

7) How much Metadata will be created on NameNode in Hadoop?

View Answer >>

8) When NameNode enter in Safe Mode?

View Answer >>

9) How to restart NameNode or all the daemons in Hadoop HDFS?

View Answer >>

10) What are the modes in which Apache Hadoop run?

View Answer >>

11) On what basis name node distribute blocks across the data nodes in HDFS?

View Answer >>

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

View Answer >>

13) Why is block size large in Hadoop?

View Answer >>

14) What is Fault Tolerance in Hadoop HDFS?

View Answer >>

15) Why is block size set to 128 MB in HDFS?

View Answer >>

16) What happens if the block on Hadoop HDFS is corrupted?

View Answer >>

17) What is the difference between NameNode and DataNode in Hadoop?

View Answer >>

18) How data or file is read in Hadoop HDFS?

View Answer >>

19) How data or file is written into Hadoop HDFS?

View Answer >>

20) Ideally what should be the block size in Hadoop?

View Answer >>

21) What is Heartbeat in Hadoop?

View Answer >>

22) How often DataNode send heartbeat to NameNode in Hadoop?

View Answer >>

23) While starting Hadoop services, DataNode service is not running?

View Answer >>

24) How HDFS helps NameNode in scaling in Hadoop?

View Answer >>

25) What is Secondary NameNode in Hadoop HDFS?

View Answer >>

26) Ideally what should be the replication factor in Hadoop?

View Answer >>

27) How one can change Replication factor when Data is already stored in HDFS

View Answer >>

28) Why HDFS performs replication, although it results in data redundancy in Hadoop?

View Answer >>

29) What is Safemode in Apache Hadoop?

View Answer >>

30) What happen when namenode enters in safemode in hadoop?

View Answer >>

31) How to remove safemode of namenode forcefully in HDFS?

View Answer >>

32) How to create the directory when Name node is in safe mode?

View Answer >>

33) Why can we not create directory /user/dataflair/inpdata001 when Name node is in safe mode?

View Answer >>

34) What is difference between a MapReduce InputSplit and HDFS block

View Answer >>

35) Explain Small File Problem in Hadoop

View Answer >>

36) What is the difference between HDFS and NAS?

View Answer >>

37) How to create Users in hadoop HDFS?

View Answer >>

38) What Happens When NameNode Goes down during File Read Operation in Hadoop?

View Answer >>

39) Explain HDFS “Write once Read many” pattern

View Answer >>

39) Can multiple clients write into an HDFS file concurrently in hadoop?

View Answer >>

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

View Answer >>

41) What should be the HDFS Block size to get maximum performance from Hadoop cluster?

View Answer >>

42) Why HDFS stores data using commodity hardware despite the higher chance of failures in hadoop?

View Answer >>

43) Who divides the file into Block while storing inside hdfs in hadoop?

View Answer >>

44) What is active and passive NameNode in HDFS?

View Answer >>

45) How is indexing done in hadoop HDFS?

View Answer >>

46) What is rack awareness in Hadoop?

View Answer >>

47) What is Erasure Coding in Hadoop?

View Answer >>

48) When and how to create hadoop archive?

View Answer >>

49) What is non-dfs used in HDFS web console

View Answer >>

50) How does HDFS ensure Data Integrity of data blocks stored in Hadoop HDFS?

View Answer >>

51) Why slaves limited to 4000 in Hadoop Version1?

View Answer >>

If in case you feel any query in HDFS interview questions and answers, so leave a comment in a section given below.

See Also-


Leave a comment

Your email address will not be published. Required fields are marked *

One thought on “Top 50+ HDFS Interview Questions and Answers