reducer
Noun
Meaning
One who, or that which, reduces.
Source: Webster's dictionarySynonyms
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I like to make records sound good. I'm more like a reducer than a producer. If an artist cannot produce themselves, what's the point?
Electroless nickel plating uses hypophosphite as the reducer while plating of other metals like silver, gold and copper typically use low molecular weight aldehydes.
And generally speaking, the reducer is fundamentally doing this combination activity.
Here's a simple example of a middleware which takes an action as input and outputs multiple actions (which will again hit the reducer).
By default, a hash of the key is used to determine which reducer gets which keys.
In the worst case, 1 reducer can be responsible for a large amount of the overall data, causing the job to take a long time and making it difficult to scale.