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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?
635How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.
771If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?
664
With the help of two examples name the map and reduce function purpose
Explain InputSplit in Hadoop MapReduce?
What is the process of changing the split size if there is limited storage space on Commodity Hardware?
Define the purpose of the partition function in mapreduce framework
How many InputSplits is made by a Hadoop Framework?
What is Mapper in Hadoop MapReduce?
Define Writable data types in Hadoop MapReduce?
Define speculative execution?
Where the mapper's intermediate data will be stored?
How many Mappers run for a MapReduce job?
How is Spark not quite the same as MapReduce? Is Spark quicker than MapReduce?
What is the need of MapReduce?
What is map/reduce job in hadoop?
Mention what is the hadoop mapreduce apis contract for a key and value class?
What are the advantages of using mapreduce with hadoop?
