What is a TaskInstance?
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what is Speculative Execution?
how JobTracker schedules a task ?
How to create custom key and custom value in MapReduce Job?
What is a partitioner and how the user can control which key will go to which reducer?
Is reduce-only job possible in Hadoop MapReduce?
What is the Hadoop MapReduce API contract for a key and value Class?
What do you mean by inputformat?
Explain how mapreduce works.
What is the sequence of execution of Mapper, Combiner, and Partitioner in MapReduce?
What is the key- value pair in Hadoop MapReduce?
Define speculative execution?
What are mapreduce new and old apis while writing map reduce program?. Explain how it works