hadoop2 YARN - MapReduce 2

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YARN stands for Yet Another Resource Negotiator.

Brief History:

YARN was developed by Yahoo in 2010 as a substitute of Map Reduce 1. It was able to overcome disadvantages which were present in Map Reduce 1.


In Map Reduce 1 Job Tracker was used to both the Job scheduling and Task Monitoring. This lead to the bottleneck in scalability of the cluster. YARN separate this two roles into 2 separate daemons which are Resource Manager and Application Master.

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