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MapReduce is not standing still while all this is going on, and in fact, the changes being introduced may not have as much immediate impact but are actually much more fundamental.
These changes were initially developed under the name MapReduce 2.0 or MRV2 . However, the name now being used is YARN 9Yet Another Resource Negotiator), which is more accurate as the changes are much more about Hadoop as a platform than MapReduce itself. The goal of YARN is to build a framework on Hadoop that allows cluster resources to be allocated to given applications and for MapReduce to be only one of these applications.
If you consider the JobTracker today, it is responsible for two quite different tasks: managing the progress of a given MapReduce job (but also identifying which cluster resources are available at any point in time) and allocating the resources to the various stages of the job.
The MapReduce interface in YARN will be unchanged, so from a client perspective, all existing code will still run on the new platform. But as new ApplicationManagers are developed, we will start to see Hadoop being used more as a generic task processing platform with multiple types of processing models supported.Successful companies are already extending the value of classic analytics by integrating cutting-edge big data technologies and outsmarting their competitors.
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