What does a split do?
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What is the difference between a MapReduce InputSplit and HDFS block?
How can you add the arbitrary key-value pairs in your mapper?
What is heartbeat in hdfs?
How many times combiner is called on a mapper node in Hadoop?
What is the difference between RDBMS with Hadoop MapReduce?
Define Writable data types in MapReduce?
what is NameNode in Hadoop?
When is it suggested to use a combiner in a MapReduce job?
What is the InputSplit in map reduce ?
Can there be no Reducer?
List out Hadoop's three configuration files?
Write a short note on the disadvantages of mapreduce