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The fundamental idea of MRv2 is to split up the two major functionalities of the JobTracker,
resource management
and job scheduling/monitoring, into separate daemons.

The idea is to have a
global ResourceManager (RM) and
per-application ApplicationMaster (AM).

An application is either a single job in the classical sense of Map-Reduce jobs or a DAG of jobs.


YARN
http://hadoop.apache.org/docs/r0.23.0/hadoop-yarn/hadoop-yarn-site/YARN.html
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