Implement Gossip about zio-keeper

[sasiharan]

@mijicd I would like to work on this issue.

[mijicd]

@sasiharan It's yours. Let me know if you need any help.

[EncodePanda]

"The Promise, and Limitations, of Gossip Protocols" by Ken Birman http://www.cs.cornell.edu/Projects/Quicksilver/public_pdfs/2007PromiseAndLimitations.pdf

[jdegoes]

See here for an example that takes into consideration geometry (AKA routing times between nodes).

[jdegoes]

Scalaz NIO is in great shape as a basis for this.

[pshemass]

lessons learnt from HashiCorp Consule gossip implementation https://arxiv.org/pdf/1707.00788.pdf

[mijicd]

More interesting materials about Gossip:

• https://www.youtube.com/watch?v=u-a7rVJ6jZY (related to the Hashicorp paper above)
• https://www.youtube.com/watch?v=QQ2n1UX3Qwg (protocol overview with a lot of references)
• "Epidemic Algorithms for Replicated Database Maintenance" by A. Demers & co.

[pshemass]

@mijicd Could you add here specification of how we want to implement that?

[mijicd]

For sure, as discussed over chat, let's have a session and design the layer properly.

[mijicd]

Closed in #66. To be followed-up and polished in subsequent issues.