Explain combiners.
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Where the mapper's intermediate data will be stored?
What is Output Format in MapReduce?
Explain task granularity
How to set which framework would be used to run mapreduce program?
Explain the Reducer's reduce phase?
Mention what are the main configuration parameters that user need to specify to run mapreduce job?
what is a Task Tracker in Hadoop?
Is reduce-only job possible in Hadoop MapReduce?
what happens when Hadoop spawned 50 tasks for a job and one of the task failed?
What are combiners? When should I use a combiner in my MapReduce Job?
how indexing in HDFS is done?
Explain what combiners are and when you should use a combiner in a mapreduce job?