Hi All,

What are some use cases of memcache incr & decr? I just don't see where a 
distributed atomic increment/decrement function would be useful when you 
know it could be wiped and reset at any point. People suggest periodically 
saving a memcache counter back to the datastore, but this guarantees 
nothing.

Of course I can see the use of a monotonically changing distributed counter.

The reason I ask is for education purposes. Why did Google engineers bother 
to implement this functionality? There must be a good rationale I am not 
aware of.

Best wishes,
Dan

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