A simple key/value store based on raft and rocksdb

It's my graduation project, about Raft consensus algorithm. Originally, I wrote these code for MIT 6.824 's labraft, but it doesn't has real storage or rpc. So I completed it with grpc and RocksDB, which makes it a real High-Available Key/Value storage.

As through, the design and implementation is too Naive, there's tons of bugs in code.

In MIT6.824, there's many unit-tests, the origin code base could PASS ALL those tests, but after migration to this project and some modification, I could make sure that these code could not pass tests in 6.824.

• Raft: follow the Raft Consensus paper, implements leader election, log replication, without snapshot or configuration change.
• KV: use RocksDB to store key/value data
• WAL: use RocksDB to store log entry, in <index,command> way
• IDL: protobuf
• RPC: grpc