what are the main configuration parameters that user need to specify to run Mapreduce Job ?

577

How to configure the number of the Combiner in MapReduce?

591

Explain how do ‘map’ and ‘reduce’ work?

577

If 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?

663

What is the fundamental difference between a MapReduce Split and a HDFS block?scale data processing?

847

What are the the issues associated with the map and reduce slots based mechanism in mapReduce?

599

What is the key- value pair in Hadoop MapReduce?

632

Does Partitioner run in its own JVM or shares with another process?

663

Where sorting is done in Hadoop MapReduce Job?

611

what is WebDAV in Hadoop?

679

Can MapReduce program be written in any language other than Java?

878

Define MapReduce?

646

what is NameNode in Hadoop?

827

How can we assure that the values regarding a particular key goes to the same reducer?

570

How to specify more than one directory as input to the MapReduce Job?

658