Wipro Infotech interview questions and answers

Which of the following concepts of OOPS means exposing only necessary information to client ?

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Answer : C. Data Hiding

Write a function that takes an integer array as an input and find the largest number in the array. You cannot sort array or use any API or searching needs ?

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Answer : #include…

Given a list of numbers ( fixed list) Now given any other list, how can you efficiently find out if there is any element in the second list that is an element of the first list (fixed list) ?

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Answer : In this method, we store all elements of second array in a hash table….

What are the advantages and disadvantages of using inline and const ?

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Answers : Advantages of inline….

What are the OOPS concepts ?

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Answer : An object is an abstraction…

What is the process to perform an incremental data load in sqoop ?

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Answer : Sqoop provides an incremental import mode.

What is commodity hardware ?

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Answer : Commodity hardware is a low-cost system identified …

What are the features of Apache HBase ?

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Answer : Linear and modular scalability…

Difference between Hive and HBase ?

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Answer : Hive is a datawarehousing package built on the top of Hadoop…

What are the different configuration files in Hadoop ?

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Answer : hadoop-env.sh,core-site.xml,hdfs-site.xml…

What are the different types of file permissions in HDFS ?

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Answer : Hadoop distributed file system (HDFS) uses a specific permissions…

Difference between nfs and hdfs ?

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Answer : NFS (Network File System) is one of the oldest and popular…

Why do we need Data Locality in Hadoop ?

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Answer : Datasets in HDFS store as blocks in DataNodes…

What are the running modes of Hadoop ?

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Answer : The three running modes of Hadoop are as follows…

What are the configuration parameters in a “MapReduce” program ?

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Answer : Input location of Jobs in the distributed file system…

What are the core components of Hadoop ?

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Answer : Hadoop is an open source framework that is meant…

What are the features of Hadoop ?

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Answer : Hadoop supports the storage and processing of big data…

What is the difference between Hadoop and RDBMS ?

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Answer : Hadoop Based on ‘Schema on Read’…

How to recover a NameNode when it is down ?

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Answer : Use the FsImage which is file system metadata…