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

What is NameNode and DataNode in HDFS?

 49

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

 40

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

 36

How data or file is written into HDFS?

 50

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

 48

What is the benifit of Distributed cache, why can we just have the file in HDFS and have the application read it?

 45

List the various HDFS daemons in HDFS cluster?

 35

What is the difference between NAS and HDFS?

 75

If data is present in HDFS and RF is defined, then how can we change Replication Factor?

 32

What do you mean by metadata in HDFS? Where is it stored in Hadoop?

 88

What is the optimal block size in HDFS?

 40

What do you mean by metadata in HDFS?

 55

Data node block size in HDFS, why 64MB?

 51

What happens if the block in HDFS is corrupted?

 37

What is Fault Tolerance in HDFS?

 47

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

Define hadoop archives?

27

Distinguish HDFS Block and Input Unit?

43

What is Block in HDFS?

47

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

64

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

42

Explain what is heartbeat in hdfs?

35

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

55

What is the throughput?

47

how does hdfs ensure data integrity of data blocks stored in hadoop hdfs?

37

Why HDFS?

36

What are the difference between of the “HDFS Block” and “Input Split”?

70

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

56

How to perform the inter-cluster data copying work in HDFS?

46

Can you define a block and block scanner in hdfs?

49

Can you change the block size of hdfs files?

45

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