- [Distributed Systems for fun and profit](http://book.mixu.net/distsys/single-page.html) [Free]
- [Distributed Systems Principles and Paradigms, Andrew Tanenbaum](http://www.amazon.com/Distributed-Systems-Principles-Paradigms-2nd/dp/0132392275) [Amazon Link]
- [Times, Clocks and Ordering of Events in Distributed Systems](http://research.microsoft.com/en-us/um/people/lamport/pubs/time-clocks.pdf) Lamport's paper, the Quintessential distributed systems primer
- [Dynamo: Amazon's Highly Available Key Value Store](http://bnrg.eecs.berkeley.edu/~randy/Courses/CS294.F07/Dynamo.pdf)
- [Bigtable: A Distributed Storage System for Structured Data](http://static.googleusercontent.com/media/research.google.com/en//archive/bigtable-osdi06.pdf)
- [Cassandra: A Decentralized Structured Storage System](http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.161.6751&rep=rep1&type=pdf) Inspired heavily by Dynamo
- [CRUSH: Controlled, Scalable, Decentralized Placement of Replicated Data](http://www.ssrc.ucsc.edu/Papers/weil-sc06.pdf), Basis of Ceph distributed storage system
- [The Chubby Lock Service for loosely coupled distributed systems](http://static.googleusercontent.com/media/research.google.com/en//archive/chubby-osdi06.pdf) Inspiration behind other Service Discovery & Coordination ZK, etcd, Consul etc.
- [Paxos made live - An engineering perspective](http://research.google.com/archive/paxos_made_live.html) Google's learning while implementing systems atop of Paxos
- [Raft Consensus Algorithm](https://raftconsensus.github.io/) Do checkout an [interesting visualization of raft](http://thesecretlivesofdata.com/raft/)
- [High Scalability](http://highscalability.com/) Several architectures of huge internet services, for eg [twitter](http://highscalability.com/blog/2013/7/8/the-architecture-twitter-uses-to-deal-with-150m-active-users.html), [whatsapp](http://highscalability.com/blog/2014/2/26/the-whatsapp-architecture-facebook-bought-for-19-billion.html)