[Proposal] Replicated log replica catch-up

[Ilya Pronin <ip...@twopensource.com>]

Hi everyone,

I've created a document with a proposal to add eager catch-up functionality
to non-leading replicated log replicas. It would allow frameworks that use
the replicated log (e.g. Aurora) to reduce failover time (by keeping
in-memory storage "hot") and potentially offload some eventually consistent
reading from a leader to standbys.

I have a working prototype of the logic described in the doc.

https://docs.google.com/document/d/1dERXJeAsi3Lnq9Akt82JGWK4pKNeJ6k7PTVCpM9ic_8/edit?usp=sharing

Please feel free to comment on the doc and let me know if you have any
concerns.

Thanks!

-- 
Ilya Pronin