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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?

 42

What is the difference between MapReduce engine and HDFS cluster?

 100

Explain NameNode and DataNode in HDFS?

 51

How data or file is read in HDFS?

 38

How is indexing done in HDFS?

 49

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

 35

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

 132

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

 33

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?

 38

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?

 38

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

 49

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 }

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

44

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

42

Explain hdfs?

58

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

46

What are tools available to send the streaming data to hdfs?

39

How data or file is written into HDFS?

50

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

45

Why is block size large in Hadoop?

56

Characterize data integrity? How does hdfs ensure information integrity of data blocks squares kept in hdfs?

46

What is a job tracker?

36

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

40

Mention what is the best way to copy files between hdfs clusters?

73

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

50

Write command to copy a file from HDFS to linux(local).

50

What are the main properties of hdfs-site.xml file?

53

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