How to submit extra files(jars, static files) for MapReduce job during runtime?
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what is distributed cache in mapreduce framework?
How to create custom key and custom value in MapReduce Job?
How is reporting controlled in hadoop?
How to set the number of reducers?
How to write a custom partitioner for a Hadoop MapReduce job?
What is a scarce system resource?
Which among the two is preferable for the project- Hadoop MapReduce or Apache Spark?
When Namenode is down what happens to job tracker?
Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?
What combiners are and when you should utilize a combiner in a map reduce job?
Map reduce jobs take too long. What can be done to improve the performance of the cluster?
What is the Reducer used for?
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