What is difference between a MapReduce InputSplit and HDFS block
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How to set mappers and reducers for Hadoop jobs?
Which among the two is preferable for the project- Hadoop MapReduce or Apache Spark?
How do you stop a running job gracefully?
Explain the process of spilling in MapReduce?
What main configuration parameters are specified in mapreduce?
What happen if the number of the reducer is 0 in MapReduce?
Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?
what is the Hadoop MapReduce APIs contract for a key and value class?
What is Reduce only jobs?
Explain the differences between a combiner and reducer
Mention when to use Map reduce mode?
What is heartbeat in hdfs?
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