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

What is the procedure to create users in HDFS and how to allocate Quota to them?

 39

How does a client read/write data in HDFS?

 37

What is the difference between MapReduce engine and HDFS cluster?

 96

Explain NameNode and DataNode in HDFS?

 43

How data or file is read in HDFS?

 38

How is indexing done in HDFS?

 43

What alternate way does HDFS provides to recover data in case a Namenode, without backup, fails and cannot be recovered?

 33

Why HDFS performs replication, although it results in data redundancy?

 109

Why ‘Reading‘ is done in parallel and ‘Writing‘ is not in HDFS?

 31

What are the key features of HDFS?

 36

How can one set space quota in Hadoop (HDFS) directory?

 28

Explain how HDFS communicates with Linux native file system?

 36

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?

 36

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

 46

What is a block in Hadoop HDFS? What should be the block size to get optimum performance from the Hadoop cluster?

 36

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

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

38

Why is block size set to 128 MB in HDFS?

39

Define hadoop archives?

27

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

52

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

35

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

32

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

43

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

47

What is the difference between Input Split and an HDFS Block?

72

How is indexing done in HDFS?

43

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

37

What is a job tracker?

36

How data or a file is written into hdfs?

50

What do you mean by metadata in Hadoop?

38

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

49

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