Conceptintro
Combiner
Also called map-side combiner, mini-reducer.
An optional local reduce on mapper output that cuts shuffle volume when the reduce function is associative and commutative.
An optional local reduce on mapper output that cuts shuffle volume when the reduce function is associative and commutative.
About this page
The build computes these levels from the evidence in the repository. Each row says what the next level needs. Read what the levels mean.
| Ladder | Level | What the next level needs |
|---|---|---|
| Human proof | H0 no proof |
|
| Lean | L0 no Lean part |
|
| Visual | V0 none |
|
| Writing | W0 stub |
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