Distributed Programming and Data Consistency w/ Notes

Distributed Programming and Data Consistencyby Paulo Gaspar@paulogaspar71Twitter: @paulogaspar7 - http://twitter.com/paulogaspar7Blog: http://paulogaspar7.blogspot.com/Consistency Perception2What is Consistency?3Our perception of consistency is related with what we know about the system and its state. That is how we figure what might fit...What isn’t?4...and what does not fit. Obviously a person will have a dierent degree of precision and tolerance than an automated system.Consistency across time5Consistency also has a time axis, with state sequences that make sense...1 of 3=> Expected event sequence (3 slide animation which SlideShare won’t handle)Consistency across time62 of 3=> Expected event sequence (3 slide animation which SlideShare won’t handle)Consistency across time73 of 3=> Expected event sequence (3 slide animation which SlideShare won’t handle)Inconsistency across time8...and state sequences that do NOT make sense.1 of 3=> UNexpected event sequence (3 slide animation which SlideShare won’t handle)Inconsistency across time92 of 3=> UNexpected event sequence (3 slide animation which SlideShare won’t handle)Inconsistency across time103 of 3=> UNexpected event sequence (3 slide animation which SlideShare won’t handle)