Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?
With the help of two examples name the map and reduce function purpose
What are mapreduce new and old apis while writing map reduce program?. Explain how it works
Mention what is the hadoop mapreduce apis contract for a key and value class?
In Map Reduce why map write output to Local Disk instead of HDFS?
How does MapReduce framework view its input internally?
What is KeyValueTextInputFormat in Hadoop MapReduce?
How do ‘map’ and ‘reduce’ work?
What is difference between a MapReduce InputSplit and HDFS block
Define the Use of MapReduce?
When Namenode is down what happens to job tracker?
Explain about the partitioning, shuffle and sort phase in MapReduce?
what are the basic parameters of a Mapper?