You have a cluster running with the Fair Scheduler enabled. There are currently no jobs running
on the cluster, and you submit a job A, so that only job A is running on the cluster. A while later,
you submit Job B. now job A and Job B are running on the cluster at the same time. How will the
Fair Scheduler handle these two jobs?
A.
When job A gets submitted, it consumes all the tasks slots.
B.
When job A gets submitted, it doesn’t consume all the task slots
C.
When job B gets submitted, Job A has to finish first, before job B can scheduled
D.
When job B gets submitted, it will get assigned tasks, while Job A continue to run with fewer
tasks.
Answers: A and D
Initially A uses all the free slots
Then when B is run, the fair scheduler allocates slots to B while A gets less
1
0
john- D cant be right. must be A & C options
0
1
Mary and Bob’s jobs would already be running when
Jane came along (or some other staggered submission use case). In this case, Bob is said
to be over his fair share and Jane under (or starved). When this occurs, the scheduler
allows Bob’s tasks to complete gracefully, and then gives the newly available slots to
the pool that has been starved the longest—in this case, Jane. The system self-corrects
over time, and ultimately, all demand is satisfied.
SO The answer is A and C.
0
0
I choose C
0
0