Architecture and Working
YARN or “Yet Another Resource Negotiator” does exactly as its name says, it negotiates for resources to run a job.
YARN, just like any other Hadoop application, follows a “Master-Slave” architecture, wherein the Resource Manager is the master and the Node Manager is the slave. The master allocates jobs and resources to the slave and monitors the cycle as a whole. The slave receives the job and requests (additional) resources to complete the job and actually undertakes the execution of the job.

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