Dean and Ghemawat: MapReduce

What changed

Developers could express many large data jobs in a compact model while runtime handled distribution and failures.

Scientific scope

2004 two-author OSDI paper and reported Google implementation; not all parallel functional programming or later data platforms.

Evidence

The linked sources identify this contribution and its scope. WRS has not independently reconstructed the scientific claims. The record is the 2004 OSDI paper and its reported Google implementation. It does not claim that the paper invented all parallel functional primitives or represents every later data-processing system.

Contributors

Jeffrey Dean · SCIENCE: Named source author of the scoped work; individual effort shares are not measured.
Sanjay Ghemawat · SCIENCE: Named source author of the scoped work; individual effort shares are not measured.

Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.

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