CCA-500 · Question #52
CCA-500 Question #52: Real Exam Question with Answer & Explanation
The correct answer is A. When Job B gets submitted, it will get assigned tasks, while job A continues to run with fewer D. When Job A gets submitted, it consumes all the task slots.. Fair scheduling is a method of assigning resources to jobs such that all jobs get, on average, an equal share of resources over time. When there is a single job running, that job uses the entire cluster. When other jobs are submitted, tasks slots that free up are assigned to the
Question
Options
- AWhen Job B gets submitted, it will get assigned tasks, while job A continues to run with fewer
- BWhen Job B gets submitted, Job A has to finish first, before job B can gets scheduled.
- CWhen Job A gets submitted, it doesn't consumes all the task slots.
- DWhen Job A gets submitted, it consumes all the task slots.
Explanation
Fair scheduling is a method of assigning resources to jobs such that all jobs get, on average, an equal share of resources over time. When there is a single job running, that job uses the entire cluster. When other jobs are submitted, tasks slots that free up are assigned to the new jobs, so that each job gets roughly the same amount of CPU time. Unlike the default Hadoop scheduler, which forms a queue of jobs, this lets short jobs finish in reasonable time while not starving long jobs. It is also a reasonable way to share a cluster between a number of users. Finally, fair sharing can also work with job priorities - the priorities are used as weights to determine the fraction of total compute time that each job should get.
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