When is the reducers are started in a MapReduce job?
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how is data partitioned before it is sent to the reducer if no custom partitioner is defined in Hadoop?
How to submit extra files(jars,static files) for MapReduce job during runtime in Hadoop?
what is a Task Tracker in Hadoop?
Difference between mapreduce and spark
How data is spilt in Hadoop?
What are advantages of Spark over MapReduce?
How to set the number of reducers?
Explain the differences between a combiner and reducer
What is an identity mapper and identity reducer?
Explain the Reducer's reduce phase?
Explain task granularity
How does inputsplit in mapreduce determines the record boundaries correctly?