skiplist::SkipList<int, std::string> sl(0x7fffffff);

bool search(const K& key, V& value);
bool insert(K key, V value);
bool remove(K key, V& value);
void dump(std::string path);
bool load(std::string path);

baidu::rpc::Server server;
if (kv_service.start() != 0) {
    LOG(FATAL) << "Fail to start kv service";
}
if (server.AddService(&kv_service, baidu::rpc::SERVER_DOESNT_OWN_SERVICE) != 0){
    LOG(FATAL) << "Fail to add kv service";
    return -1;
}
baidu::rpc::ServerOptions options;
if (server.Start(FLAGS_port, &options) != 0) {
    LOG(FATAL) << "Fail to start rpc service";
    return -1;
}
server.RunUntilAskedToQuit();