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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?

 43

How does a client read/write data in HDFS?

 47

What is the difference between MapReduce engine and HDFS cluster?

 106

Explain NameNode and DataNode in HDFS?

 62

How data or file is read in HDFS?

 47

How is indexing done in HDFS?

 59

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

 39

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

 146

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

 37

What are the key features of HDFS?

 46

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

 38

Explain how HDFS communicates with Linux native file system?

 55

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?

 42

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

 59

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

 42

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

Explain the difference between an hdfs block and input split?

67

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

49

How one can change Replication factor when Data is already stored in HDFS

49

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

56

How one can format Hadoop HDFS?

55

How does hdfs get a good throughput?

69

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

40

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

72

How data or file is read in Hadoop HDFS?

47

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

80

Can we change the document present in hdfs?

51

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

70

Explain hdfs?

64

What is the difference between MapReduce engine and HDFS cluster?

106

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

69

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