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

What are the main hdfs-site.xml properties?

 41

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

 33

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

 39

How to remove safemode of namenode forcefully in HDFS?

 36

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

 47

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

 49

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

 42

Explain HDFS “Write once Read many” pattern?

 30

Why is block size set to 128 MB in HDFS?

 39

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

 35

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

 53

How one can format Hadoop HDFS?

 45

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

 38

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

 33

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

 47

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

In HDFS, how Name node determines which data node to write on?

50

How to create Users in hadoop HDFS?

71

What is the optimal block size in HDFS?

38

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

64

What happens if the block on Hadoop HDFS is corrupted?

56

Why HDFS stores data using commodity hardware despite the higher chance of failures?

34

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

42

Replication causes data redundancy and consume a lot of space, then why is it pursued in hdfs?

39

How to Delete file from HDFS?

57

Explain about the indexing process in hdfs?

71

What is a job tracker?

36

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

33

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

52

How is indexing done in Hadoop HDFS?

48

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

60

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