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In MapReduce Data Flow, when Combiner is called?
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When is the reducers are started in a MapReduce job?
Explain the Reducer's reduce phase?
What is streaming?
What is the difference between Job and Task in MapReduce?
What is shuffling and sorting in Hadoop MapReduce?
How many Mappers run for a MapReduce job in Hadoop?
How to optimize MapReduce Job?
Mention when to use Map reduce mode?
Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?
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?
What is KeyValueTextInputFormat in Hadoop MapReduce?
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