Adding logs in handle_raft_event as preparation.

We can get LSN of logs, as well as where the leader is and
where our last_commit index is.

These information can be helpful for us to determine if we are
catching up as well as de-deup already commited log.

Signed-off-by: Xiaoxi Chen <[email protected]>

src/lib/replication/repl_dev/raft_repl_dev.cpp

@@ -1030,6 +1030,11 @@ std::pair< bool, nuraft::cb_func::ReturnCode > RaftReplDev::handle_raft_event(nu
     if (type == nuraft::cb_func::Type::GotAppendEntryReqFromLeader) {
         auto raft_req = r_cast< nuraft::req_msg* >(param->ctx);
         auto const& entries = raft_req->log_entries();
+        auto start_lsn = raft_req->get_last_log_idx() + 1;
+        RD_LOGD("Raft channel: Received {} append entries on follower from leader, term {}, lsn {} ~ {} , my commited "
+                "lsn {} , leader commmited lsn {}",
+                entries.size(), raft_req->get_last_log_term(), start_lsn, start_lsn + entries.size() - 1, m_commit_upto_lsn.load(),
+                raft_req->get_commit_idx());
 
         if (!entries.empty()) {
             RD_LOGT("Raft channel: Received {} append entries on follower from leader, localizing them",