I want to ensure consistency between 3 servers. It's a consensus problem. Each server listens to the users and saves the collected data in a local file. I tried to use Rpc to send the new data to all the others servers but in vain. Also I want to use the algorithm paxos to ensure the consistency. I just want to know if the solution that I made is the optimized one or I can use socket instead or an other algorithm rather than paxos like raft.
I wish you understand my problem. Thanks in advance :)
First thing you should decide what does it mean: every server listens for user requests. What happens next? Do these servers immediately apply those requests locally, or they send them to a leader?
In the first case - each node applies changes locally and them sends them to other nodes - this is a multi-leader replication. As you could guess, it is challenging to agree on values, as it is possible that two different request change the same data on different. There are few options here, to make the system eventually consistent, but that's probably not what you want.
Now we get to consensus. In a big picture, paxos/raft/etc are all single leader replication systems. One of nodes will be elected as leader and every other node eventually will get the same sequence of events - that will be the consensus part.
I recommend to check raft instead of paxos - there are many libs for either, but I find raft to be a bit easier to work with.