Explain what is the function of mapreduce partitioner?
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Compare RDBMS with Hadoop MapReduce.
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In MapReduce Data Flow, when Combiner is called?
What is heartbeat in hdfs? Explain.
What do you mean by inputformat?
How to set mappers and reducers for MapReduce jobs?
How to set the number of reducers?
What is difference between an input split and hdfs block?
What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?
What are the key differences between Pig vs MapReduce?
What are the benefits of Spark over MapReduce?
How to create a custom key and custom value in MapReduce Job?