A few map tasks on a slow municipal worker drag out an otherwise healthy MapReduce job. Which classic framework idea races duplicates to mitigate stragglers?
Select an answer to reveal the explanation.
Short Explanation
When one bakery tray lags, start a twin tray elsewhere and take whichever finishes first. Speculative execution races duplicates of stragglers. Wiping splits or reformatting HDFS is not the fix.
Full Explanation
Speculative execution is a classic MapReduce straggler mitigation: the framework may schedule duplicate attempts of unusually slow tasks and accept the first successful completion. It does not remove input, intentionally create skew, or demand HDFS reformats. Operators should still investigate chronic slow nodes separately.