{"id":"mapreduce-combiner-transparent","text":"Applying a combiner never changes final results; it only reduces intermediate record volume — the combiner must be semantically invisible","truth_value":"IN","source":"entries/2026/05/29/mapreduce-framework-test_mapreduce.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"mapreduce-combiner-transparent","truth_value":"IN","reason":"premise"}]}}