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CCA-410 · Question #37
CCA-410 Question #37: Real Exam Question with Answer & Explanation
The correct answer is D. After a period of time, the TaskTracker will kill the Map Task.. The TaskTracker nodes are monitored. If they do not submit heartbeat signals often enough, they are deemed to have failed and the work is scheduled on a different TaskTracker. A TaskTracker will notify the JobTracker when a task fails. The JobTracker decides what to do then: it m
Question
What happens if a Mapper on one node goes into an infinite loop while running a MapReduce job?
Options
- AAfter a period of time, the JobTracker will restart the TaskTracker on the node on which the map task
- BThe Mapper will run indefinitely; the TaskTracker must be restarted to kill it
- CThe job will immediately fail.
- DAfter a period of time, the TaskTracker will kill the Map Task.
Explanation
- The TaskTracker nodes are monitored. If they do not submit heartbeat signals often enough, they are deemed to have failed and the work is scheduled on a different TaskTracker. * A TaskTracker will notify the JobTracker when a task fails. The JobTracker decides what to do then: it may resubmit the job elsewhere, it may mark that specific record as something to avoid, and it may may even blacklist the TaskTracker as unreliable.
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