Apache HDFS Hadoop Distributed File System Interview Questions
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What is hdfs block size?

51

How hdfs is different from traditional file systems?

42

How is hdfs block size different from traditional file system block size?

40

How data or a file is written into hdfs?

44

What is a namenode in hadoop?

39

What is secondary namenode?

42

What do you mean by meta data in hdfs? List the files associated with metadata.

24

Explain the hdfs architecture and list the various hdfs daemons in hdfs cluster?

42

Can you modify the file present in hdfs?

71

Define data integrity?

27

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

25

Hdfs stores data using commodity hardware which has higher chances of failures. So, how hdfs ensures the fault tolerance capability of the system?

21

Define hadoop archives?

20

What is secondary namenode? Is it a substitute or back up node for the namenode?

41

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

28


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

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

56


How are file systems checked in hdfs?

23


How would you import data from MYSQL into HDFS ?

32


How to keep files in HDFS?

44


Differentiate HDFS & HBase?

35






What does heartbeat in hdfs means?

20


How HDFS helps NameNode in scaling in Hadoop?

42


If a particular file is 50 mb, will the hdfs block still consume 64 mb as the default size?

26


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

35


Why is Reading done in parallel and writing is not in HDFS?

38


What is the difference between MapReduce engine and HDFS cluster?

89


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

37


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

22


What is non-dfs used in hdfs web console

59


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

57