Seven Databases in Seven Weeks: A Guide to Modern Databases and the NoSQL Movement by Luc Perkins & Eric Redmond & Jim Wilson

Seven Databases in Seven Weeks: A Guide to Modern Databases and the NoSQL Movement by Luc Perkins & Eric Redmond & Jim Wilson

Author:Luc Perkins & Eric Redmond & Jim Wilson [Perkins, Luc]
Language: eng
Format: azw3
Tags: Pragmatic Bookshelf
Publisher: Pragmatic Bookshelf
Published: 2018-04-05T04:00:00+00:00


"17sonsrecords"

5

"acid"

1

"acousticguitar"

2

"action"

2

"adventure"

3

"aksband"

1

"alternativ"

1

"alternativ"

3

"ambient"

28

"autodidacta"

17

What happened? In short, the reducer reduced the output by combining like mapper rows in accordance with our Reducer Function. The CouchDB mapreduce engine works conceptually like the other mapreducers we’ve seen before (like MongoDB’s ​Mapreduce (and Finalize)​). Specifically, here’s a high-level outline of the steps CouchDB takes to build a view:

Send documents off to the mapper function.



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