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The Effects of YARN

YARN (Yet Another Resource Negotiator) is a high-visibility advancement of Hadoop MapReduce that is currently in version 2.0.x and will eventually make it into the current stable release. Many in the Hadoop community cannot wait for it to mature, as it fills a number of gaps. At a high level, YARN splits the responsibilities of the JobTracker and TaskTrackers into a single ResourceManager, one NodeManager per node, and one ApplicationMaster per application or job. The ResourceManager and NodeManagers abstract away computational resources from the current map-and-reduce slot paradigm and allow arbitrary computation. Each ApplicationMaster handles a framework-specific model of computation that breaks down a job into resource allocation ....


  

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