What is the function of mapreduce partitioner?
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How does fault tolerance work in mapreduce?
How many Mappers run for a MapReduce job?
What is the purpose of textinputformat?
How is reporting controlled in hadoop?
How data is spilt in Hadoop?
What is a IdentityMapper and IdentityReducer in MapReduce ?
If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?
How to write a custom partitioner for a Hadoop MapReduce job?
How do Hadoop MapReduce works?
What are the advantages of using map side join in mapreduce?
What is identity mapper and chain mapper?
How to create custom key and custom value in MapReduce Job?
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