YARN

YARN – It’s used to manage the resources for cluster

Y —> Yet

A —> Another

R —> Resource

N —> Negotiator

Why we need YARN in Hadoop 

Hadoop 1.0 is tightly coupled with cluster resource management and map reduce.

Job tracker which does the cluster resource management function

Job tracker is responsible for execution of mapreduce i.e it reserves & schedule the slot for all task , configure ,run and monitor and task .

If it fails  it need to reinitialize and reallocate the mechanism again

Due to this tightly coupled architecture , YARN introduced to look over the cluster management and map reduce will streamline the dataprocessing