how indexing in HDFS is done?
Detail description of the Reducer phases?
How many Mappers run for a MapReduce job in Hadoop?
Why Mapreduce output written in local disk?
What is RecordReader in a Map Reduce?
What is the need of MapReduce in Hadoop?
What happens when a DataNode fails during the write process?
What is a "map" in Hadoop?
What is reduce side join in mapreduce?
With the help of two examples name the map and reduce function purpose
Define Writable data types in Hadoop MapReduce?
What is the use of InputFormat in MapReduce process?
how JobTracker schedules a task ?