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Frequently Asked Hadoop Interview Questions

1) What is Hadoop?
Hadoop is a distributed computing platform. It is written in Java. It consist of the features like Google File System and MapReduce.
2.) What is Hadoop Map Reduce ?
For processing large data sets in parallel across a hadoop cluster, Hadoop MapReduce framework is used. Data analysis uses a two-step map and reduce process.
3).How Hadoop MapReduce works?
In MapReduce, during the map phase it counts the words in each document, while in the reduce phase it aggregates the data as per the document spanning the entire collection. During the map phase the input data is divided into splits for analysis by map tasks running in parallel across Hadoop framework.
4.)Explain what is sqoop in Hadoop ?
To transfer the data between Relational database management (RDBMS) and Hadoop HDFS a tool is used known as Sqoop. Using Sqoop data can be transferred from RDMS like MySQL or Oracle into HDFS as well as exporting data from HDFS files to RDBMS
5.) What is the Hadoop MapReduce API contract for a key and value Class?
The Key must implement the org.apache.hadoop.io.WritableComparable interface. The value must implement the org.apache.hadoop.io.Writable interface.
6) What is big data?
Big Data is nothing but an assortment of such a huge and complex data that it becomes very tedious to capture, store, process, retrieve and analyze it with the help of on-hand database management tools or traditional data processing techniques.
7 .Explain what is sqoop in Hadoop ?
To transfer the data between Relational database management (RDBMS) and Hadoop HDFS a tool is used known as Sqoop. Using Sqoop data can be transferred from RDMS like MySQL or Oracle into HDFS as well as exporting data from HDFS file to RDBMS
8. What is the Hadoop MapReduce API contract for a key and value Class?
A.The Key must implement the org.apache.hadoop.io.WritableComparable interface. The value must implement the org.apache.hadoop.io.Writable interface.
The above questions are frequently asked interview question. Besant Technologies offer best Hadoop Training in Chennai with best placement support 


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