Usage of redis

[AndBondStyle]

As I understand, redis is currently used as a simple queue, with pgsync being it's only subscriber (and publisher). Maybe redis is useful for keeping the data pulled from db in case pgsync instance restarts, however it's always an option to pull that data from db again (am I right?). So basically redis can be eliminated, and intermediate buffer could be kept directly in python. What am I missing?

The same question also appeared in #355