YARN scheduler is responsible for scheduling RESOURCES to user applications based on a DEFINED scheduling policy. YARN provides three scheduling options - FIFO scheduler, Capacity scheduler and Fair scheduler.

FIFO Scheduler - FIFO scheduler PUTS application requests in queue and runs them in the order of submission.

Capacity Scheduler - Capacity scheduler has a SEPARATE dedicated queue for smaller jobs and starts them as soon as they are submitted.

Fair Scheduler - Fair scheduler dynamically BALANCES and allocates resources between all the running jobs.

YARN scheduler is responsible for scheduling resources to user applications based on a defined scheduling policy. YARN provides three scheduling options - FIFO scheduler, Capacity scheduler and Fair scheduler.

FIFO Scheduler - FIFO scheduler puts application requests in queue and runs them in the order of submission.

Capacity Scheduler - Capacity scheduler has a separate dedicated queue for smaller jobs and starts them as soon as they are submitted.

Fair Scheduler - Fair scheduler dynamically balances and allocates resources between all the running jobs.