Answer / Aman Saxena

JobTracker was the central management component in Hadoop MapReduce, responsible for managing and coordinating tasks across a cluster. It maintained information about the jobs running on the cluster, allocated resources (such as slots and task slots) to these jobs, and scheduled tasks on nodes within the cluster.nnHowever, with the introduction of YARN (Yet Another Resource Negotiator), JobTracker has been replaced by two main components: ResourceManager and ApplicationMaster. nnResourceManager is responsible for resource allocation in a Hadoop cluster and manages the NodeManagers running on different nodes.nnApplicationMaster is a user-defined component that communicates with the ResourceManager to manage tasks within an application running on the cluster.

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