How is Spark not quite the same as MapReduce? Is Spark quicker than MapReduce?

656

What are combiners? When should I use a combiner in my MapReduce Job?

948

What do you understand by the term Straggler ?

733

what are the most common input formats defined in Hadoop?

695

For a job in Hadoop, is it possible to change the number of mappers to be created?

828

what is WebDAV in Hadoop?

785

what is storage and compute nodes?

788

What do you know about nlineinputformat?

735

What are the various InputFormats in Hadoop?

690

Whether the output of mapper or output of partitioner written on local disk?

717

How to compress mapper output in Hadoop?

732

What is difference between an input split and hdfs block?

694

What is heartbeat in hdfs?

702

How can we control particular key should go in a specific reducer?

955

What is a combiner and where you should use it?

710