This is a simple key-value store that is replicated using jmsadair/raft. This is a minimal implementation that is intended to serve as an example of how one might use raft in a real system as well as for testing purposes. It should not be used in production.
To see a demonstration of this repository, just run
bash demo.sh
This will execute a script that starts a cluster of five nodes, submits some operations, and crashes two of the nodes. You can also provide
some arguments to demo.sh to modify the demonstration. For example, you can specify the number of clients and the number of operations each
client should submit as so:
bash demo.sh -c 5 -o 500
This will again spin up a cluster of five nodes; however, there will now be 5 clients concurrently submitting 500 operations each. It's also
possible to generate a Jepsen log which can be used to verify the linearizability of the operations
(take a look at Knossos) by passing the --history flag.
bash demo.sh -c 5 -o 500 --history
Refer to demo.sh or run bash demo.sh --help to see all options.
This repository also includes a Jepsen test for the key-value store. To run the test, you are going to need to setup a Jepsen environment, including a control node with a JVM and Leiningen, and a collection of Debian nodes that have Go installed. There are instructions for setting up a Jepsen environent here.
Once your environment is ready, you should be able to run something like:
lein run test --test-count 10
This runs a test that randomly partitions the cluster every few seconds while operations are being submitted. Once complete, the test will verify that the history is linearizable.