cluster.go is the source file which is used to generate cluster.a library file. There are many methods defined in this library which internally implements zmq.

Few methods are described below :-

• NewServer(serverId int, configFile string) Server

• It will return a Server object by passing serverId as one of the argument , other details of the Server are stored in configFile . These details can be IP address (alongwith port number)

• SendMessage(server Server)
  • It will start sending any message (in the format as mentioned in cluster.Envelope) as soon as invoked.
• ReceiveMessage(server Server)
  • It will start receiving on the mentioned port (in the format as mentioned in cluster.Envelope) as soon as invoked.

go get github.com/RaviKumarYadav/Raft/cluster
cd .../github.com/RaviKumarYadav/Raft/cluster
go test

• Cluster is a group of different Servers working and communicating with each other to form a larger system that will later be used for implementing distributed system.

• Server uses Messages to communicate with each other . Each server is assigned a unique ServerId which helps in identifying any Server in the System/Cluster.

• Message being exchanged also have a structure which contains :-

• MessageId
  • Its unique for each Message.
• Pid
  • It reflects the target server or the recipient server for the message.
• MsgType
  • Messages can be of different types like :-
    • AppendEntriesRequest
    • AppendEntriesResponse
    • RequestVoteRequest
    • RequestVoteResponse
• SenderId
  • ServerId of the sending server.
• Term
  • Term of the Server sending the message.
• Voted
  • Voting Status of the Server for the said term.

To run individually just pass "ServerId" as command line argument eg :- go run mainFile.go 1 , where "1" is the ServerId whose other details are present in configFile which will be fetched by the program.

There are few cases present in file "Raft/cluster/cluster_test.go". It tests for following :-

• Unicast
  • Peer-Peer messages sent by one server to another (by each server in cluster)
• Multicast
  • Messages sent by each server is listened by each member(server) in the cluster
• Unicast and Multicast
  • Mix of Unicast and Multicast messages were sent by each server
• Cyclic Unicast
  • Each server sent messages to another server which next to it (in terms of ServerId)

cd github.com/RaviKumarYadav/Raft/cluster
go test

IIT Bombay