why all writes must go to the master and why writing to a slave makes no sense?

Yasu

New Member
http://www.pcpro.co.uk/realworld/355477/understanding-the-nosql-movement:\[quote\] However, all writes must go to the master, because the data flow is one-way from master to slaves, and writing to a slave makes no sense.\[/quote\]I'm having trouble understanding that statement. From my limited understanding, I just can't see why does this limitation exists. Isn't there some way for the slave to "talk" to the master so a user could simply write to a slave, and the slave will then inform the master of the write.. no?
 
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