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

Explain the hdfs architecture?

 47

How does hdfs provides good throughput?

 50

Can we have different replication factor of the existing files in hdfs?

 52

How will you perform the inter cluster data copying work in hdfs?

 35

Suppose there is file of size 514 mb stored in hdfs (hadoop 2.x) using default block size configuration and default replication factor. Then, how many blocks will be created in total and what will be the size of each block?

 125

List the files associated with metadata in hdfs?

 32

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

 52

What is a rack awareness algorithm and why is it used in hadoop?

 35

What is a block?

 53

What is throughput? How does hdfs provides good throughput?

 56

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

 39

Define hadoop archives? What is the command for archiving a group of files in hdfs.

 35

What do you mean by the high availability of a namenode?

 29

What is the difference between nas (network attached storage) and hdfs?

 50

What is a rack awareness algorithm?

 58

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

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

45

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

46

How do you do a file system check in hdfs?

37

What is the difference between NAS and HDFS?

75

What is the difference between nas (network attached storage) and hdfs?

50

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

59

Replication causes data redundancy then why is is pursued in HDFS?

46

What is the difference between namenode, backup node and checkpoint namenode?

48

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

70

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

147

Mention what is the best way to copy files between hdfs clusters?

71

Can we change the document present in hdfs?

35

Mention what is the difference between hdfs and nas?

67

Why do we need hdfs?

52

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

36

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