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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?

 35

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?

 49

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

 44

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?

 56

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?

 40

How to format the HDFS? How frequently it will be done?

 36

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 to keep files in HDFS?

53

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

35

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

24

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

36

What is the importance of dfs.namenode.name.dir in HDFS?

56

What happens when two users try to access to the same file in HDFS?

77

How does HDFS ensure Data Integrity of data blocks stored in HDFS?

39

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

44

How would you import data from MYSQL into HDFS ?

38

How HDFS helps NameNode in scaling in Hadoop?

58

If the source data gets updated every now and then, how will you synchronize the data in hdfs that is imported by sqoop?

147

Can we have different replication factor of the existing files in hdfs?

52

How does hdfs give great throughput?

32

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

39

When NameNode enter in Safe Mode?

35

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