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BOOK: Professional NoSQL
This is the forum to discuss the Wrox book Professional NoSQL by Shashank Tiwari ; ISBN: 978-0-470-94224-6
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Old February 22nd, 2012, 01:10 PM
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Default Chapter 9: Eventual Consistency

Hi

I've been working through this book but I've been completely confused by the eventual consistency example:

"R is the number of nodes to be read from
W is the number of nodes written to
N is the total number of nodes in the cluster"

How can R + W ever be > N?
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Old February 24th, 2012, 02:07 AM
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Default

I figured this out shortly after I posted it; since reads and writes are not mutually exclusive, a node can support reading, writing or both. So there are 2 operations, R + W is at most 2N.

Oh well, it was nice to be the first post in this book's forum :)
 


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