Hadoop Interview Questions – Part 4

31. Explain the Reducer’s reduce phase?
Ans: In this phase the reduce (MapOutKeyType, Iterable, Context) method is called for each pair in the grouped inputs. The output of the reduce task is typically written to the File System via Context. write (ReduceOutKeyType, ReduceOutValType). Applications can use the Context to report progress, set application-level status messages and […]

By |December 10th, 2014|Categories: Hadoop|Tags: , , |0 Comments

Hadoop Interview Questions – Part 3

21. Which object can be used to get the progress of a particular job?
Ans: Context
22. What is next step after Mapper or MapTask?
Ans: The output of the Mapper is sorted and Partitions will be created for the output. Number of partition depends on the number of reducer.
23. How can we control particular key should go […]

By |December 4th, 2014|Categories: Hadoop|Tags: , , |0 Comments

Hadoop Interview Questions – Part 2

11. What Mapper does?
Ans: Maps are the individual tasks that transform input records into intermediate records. The transformed intermediate records do not need to be of the same type as the input records. A given input pair may map to zero or many output pairs.
12. What is the Input Split in map reduce software?
Ans: An […]

By |December 3rd, 2014|Categories: Hadoop|Tags: , , |0 Comments

JBoss EAP Ports

By |November 29th, 2014|Categories: JBoss, Other Middlewares|Tags: , , , |0 Comments

Hadoop Interview Questions – Part 1

1. What is Hadoop framework?
Ans: Hadoop is an open source framework which is written in java by apache software foundation. This framework is used to write software application which requires to process vast amount of data (It could handle multi tera bytes of data). It works in-parallel on large clusters which could have 1000 of […]

By |November 13th, 2014|Categories: Hadoop|0 Comments