Can `_node->is_leader()` be used?

[kishorenc]

The examples use a _leader_term variable to check if the current node is a leader:

https://github.com/baidu/braft/blob/master/example/counter/server.cpp#L153

Instead, can one use _node->is_leader()?

https://github.com/baidu/braft/blob/master/src/braft/raft.h#L619

What's the difference between these 2 different approaches?

[zergvszerg]

I'm guessing the big difference be that Node::is_leader() try to acquire a bthread_mutex_t before reading the |_state|, while the fsm(example::Counter) just use an atomic load