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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 }

How is indexing done in Hadoop HDFS?

48


Would you be able to change the block size of hdfs files?

41


Can multiple clients write into a Hadoop HDFS file concurrently?

47


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

47


Define HDFS and talk about their respective components?

47


If I create a folder in HDFS, will there be metadata created corresponding to the folder? If yes, what will be the size of metadata created for a directory?

34


Explain how indexing in hdfs is done?

30


How NameNode tackle Datanode failures in HDFS?

32


How to Delete directory from HDFS?

36


How are file systems checked in hdfs?

25


File permissions in HDFS?

27


What do you mean by metadata in Hadoop?

38


Describe HDFS Federation?

38


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

43


While processing data from hdfs, does it execute code near data?

38