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Explain how mapreduce works.
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Which among the two is preferable for the project- Hadoop MapReduce or Apache Spark?
Explain about the partitioning, shuffle and sort phase in MapReduce?
What is LazyOutputFormat in MapReduce?
How to create custom key and custom value in MapReduce Job?
What is map/reduce job in hadoop?
How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?
When should you use a reducer?
Name job control options specified by mapreduce.
What are the various InputFormats in Hadoop?
how indexing in HDFS is done?
What is the role of recordreader in hadoop mapreduce?
What is a partitioner and how the user can control which key will go to which reducer?
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