Why MapReduce uses the key-value pair to process the data?
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Is it possible to search for files using wildcards?
What is heartbeat in hdfs? Explain.
It can be possible that a Job has 0 reducers?
Explain the process of spilling in MapReduce?
When is the reducers are started in a MapReduce job?
What is the difference between a MapReduce InputSplit and HDFS block?
Define Writable data types in MapReduce?
How to set the number of reducers?
what is a sequence file in Hadoop?
What is the Hadoop MapReduce API contract for a key and value Class?
What are the benefits of Spark over MapReduce?
How do ‘map’ and ‘reduce’ work?
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