How to get the single file as the output from MapReduce Job?
how can you debug Hadoop code?
Can MapReduce program be written in any language other than Java?
Mention what are the main configuration parameters that user need to specify to run mapreduce job?
How does fault tolerance work in mapreduce?
What is the difference between HDFS block and input split?
What is Reduce only jobs?
How is reporting controlled in hadoop?
What is a RecordReader in Hadoop MapReduce?
Explain the general mapreduce algorithm
Where the mapper's intermediate data will be stored?
What are the various InputFormats in Hadoop?
Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?