A city needs to re-encode millions of archived sensor files into a new columnar layout without aggregating across keys. Which MapReduce pattern awareness is most relevant?
Select an answer to reveal the explanation.
Short Explanation
Sometimes you just need every page photocopied into a new format—no need to total the whole binder. Map-only jobs cover those per-record transforms. Forcing a heavy reduce when nothing groups is busywork.
Full Explanation
Not every MapReduce workload needs a substantial reduce phase. Map-only (or reduce-light) patterns apply when the work is per-split transformation, filtering, or format conversion without cross-key aggregation. Requiring a fixed reducer count or forbidding maps under normal replication misstates framework flexibility.