adspace


What is a record reader?

Answer Posted / Shashi Kant Mishra

A RecordReader in Hadoop is an abstraction for reading data from various input sources (e.g., text files, databases). It provides the MapReduce framework with key-value pairs, where the key is usually the offset within the file and the value is the actual data.

Is This Answer Correct ?    0 Yes 0 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

Which modes can Hadoop be run in? List a few features for each mode?

542


Give me the examples of Columnar database ?

669


How can you set an arbitrary number of Reducers to be created for a job in Hadoop?

551


How job tracker schedules an assignment?

496