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Apache HDFS Hadoop Distributed File System Interview Questions
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What are the main hdfs-site.xml properties?

 34

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

 27

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

 35

How to remove safemode of namenode forcefully in HDFS?

 32

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

 43

What are file permissions in HDFS? how does HDFS check permissions for files/directory?

 44

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

 40

Explain HDFS “Write once Read many” pattern?

 28

Why is block size set to 128 MB in HDFS?

 35

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

 30

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

 47

How one can format Hadoop HDFS?

 39

Explain what happens if, during the PUT operation, HDFS block is assigned a replication factor 1 instead of the default value 3?

 36

How to format the HDFS? How frequently it will be done?

 28

Which one is the master node in HDFS? Can it be commodity hardware?

 45

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

What happens if the block in HDFS is corrupted?

29

What does hdfs mean?

33

Explain what is a difference between an input split and hdfs block?

25

Why do we need hdfs?

48

How to split single hdfs block into partitions rdd?

38

What is the command for archiving a group of files in hdfs.

32

If the source data gets updated every now and then, how will you synchronize the data in hdfs that is imported by sqoop?

133

What is throughput? How does HDFS get a good throughput?

42

What is the difference between NAS and HDFS?

64

What is throughput? How does hdfs provides good throughput?

52

What is a Block Scanner in HDFS?

85

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

36

Explain what is heartbeat in hdfs?

29

How one can format Hadoop HDFS?

39

Explain how indexing is done in hdfs?

32

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