In the below example lets see how to create a custom Writable that can be used as a key in…
We can implement secondary sorting in mapreduce using the below steps 1. Make the key a composite of the natural…
The following is an ordered sequence of XML elements for map-reduce job and you must specify them in order when…
There are many input and output formats supported in hadoop out of the box and we will explore the same…
What will be the mapper,reducer and the partitioner that will be used in mapreduce program if we dont specify any…
Some applications don’t want files to be split, as this allows a single mapper to process each input file in…
In the real world, user code is buggy, processes crash, and machines fail. One of the major benefits of using…