Description
1. Problem Definition
We talked extensively in class about the overlay networks and how they can be used to
provide services. The goal of this project is to implement in Elixir using the actor model
the Tapestry Algorithm and a simple object access service to prove its usefulness. The
specification of the Tapestry protocol can be found in the paperTapestry: A Resilient Global-Scale Overlay for Service Deployment by Ben Y. Zhao, Ling
Huang, Jeremy Stribling, Sean C. Rhea, Anthony D. Joseph and John D. Kubiatowicz. Link
to paper- https://pdos.csail.mit.edu/~strib/docs/tapestry/tapestry_jsac03.pdf. You can
also refer to Wikipedia page: https://en.wikipedia.org/wiki/Tapestry_(DHT) . Here is
other useful link: https://heim.ifi.uio.no/michawe/teaching/p2p-ws08/p2p-5-6.pdf .
Here is a survey paper on comparison of peer-to-peer overlay network schemeshttps://zoo.cs.yale.edu/classes/cs426/2017/bib/lua05survey.pdf.
You have to implement the network join and routing as described in the Tapestry paper
(Section 3: TAPESTRY ALGORITHMS). You can change the message type sent and the specific
activity as long as you implement it using a similar API to the one described in the paper.
2. Requirements
Input: The input provided (as command line to your program will be of the
form:
mix run project3.exs numNodes numRequests
Where numNodes is the number of peers to be created in the peer to peer system and
numRequests the number of requests each peer has to make. When all peers performed
that many requests, the program can exit. Each peer should send a request/second.
Output: Print the maximum number of hops (node connections) that must be traversed
for all requests for all nodes.
Actor modeling: In this project you have to use exclusively the actor facility in Elixir (i.e.
GenServer) (projects that do not use multiple actors or use any other form of parallelism
will receive no credit). You should have one actor for each of the peers modeled.
README file: In the README file you have to include the following material:
• Team members
• What is working
• What is the largest network you managed to deal with
3. BONUS
In the above assignment, there is no failure at all. For a 20% bonus, implement node and
failure models (a node dies, a connection dies temporarily or permanently). Dealing with
failures are described in Section 3 of the paper. Write a report describing how you tested
that the systems are resilient and your findings.
(Also, set up failure parameter as an input argument so your bonus results can be tested
without having to modify code)