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Hadoop Interview Questions
Questions Answers Views Company eMail

What is Fault Tolerance in HDFS?

 47

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?

 43

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?

 40

How is indexing done in HDFS?

 50

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?

 38

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

 30

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

Un-Answered Questions { Hadoop }

What ensures load balancing of the server in Kafka?

660

Give a list of Collection data type in Cassandra?

73

When a large data set is maintained?

727

How hdfs is different from traditional file systems?

49

When is it not recommended to use MapReduce paradigm for large scale data processing?

659

What is kafka?

556

Whenever we run hive query, new metastore_db is created. Why?

684

Which command is available to show the current HBase user?

161

I have a relation r. How can I get the top 10 tuples from the relation r?

570

Explain a simple Map/Reduce problem.

725

What is the bottom layer of abstraction in the Spark Streaming API ?

800

What do you mean by Schema Resolution?

59

What is Spark DataFrames?

276

What should be the HDFS Block size to get maximum performance from Hadoop cluster?

37

What is flatten in pig?

625

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