An overview of YARN components
YARN divides the responsibilities of JobTracker into separate components, each having a specified task to perform. In Hadoop-1, the JobTracker takes care of resource management, job scheduling, and job monitoring. YARN divides these responsibilities of JobTracker into ResourceManager and ApplicationMaster. Instead of TaskTracker, it uses NodeManager as the worker daemon for execution of map-reduce tasks. The ResourceManager and the NodeManager form the computation framework for YARN, and ApplicationMaster is an application-specific framework for application management.
ResourceManager
A ResourceManager is a per cluster ...
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