PCG Overlay

Background

Building a custom overlay on top of the a-shine/butter framework (unstructured p2p application framework) focused on implementing group based persistent data management techniques to improve fault-tolerance (specifically information availability) on high churn networks.

Try demo

To try a demo of the PCG persistent storage management overlay in action:

1. Make sure to have Go (1.17) installed
2. Clone the repository
3. Run the demo CLI program with:

   go run demo.go

4. Now start several nodes in different terminal instances, try adding and retrieving information from the various nodes. Watch as information persists beyond the existence of any single node.

A good demo walk-through:

1. Start a node in one terminal instance with go run demo.go
2. Start another node in another terminal instance with the same command
3. Add a piece of information to the first node with using the CLI interface
4. Retrieve the information from the second node with the CLI interface
5. Kill the first node with ctrl-c in the first terminal instance
   • Note: Ignore the dial tcp 192.168.0.23:41991: connect: connection refused log message - it is a non-fatal log generated by the Butter framework to indicate that a known host has become unreachable (it disappears once the known host list is updated)
6. Retry to retrieve the information from the second node - observe that the information has persisted beyond the existence of the node responsible for adding it