add some logging

Author: kjnilsson

deps/rabbit/src/rabbit_fifo_client.erl

@@ -723,12 +723,20 @@ handle_ra_event(_QName, _From,
                 {rejected, {not_leader, _UndefinedMaybe, _Seq}}, State0) ->
     % TODO: how should these be handled? re-sent on timer or try random
     {ok, State0, []};
-handle_ra_event(QName, _, timeout, #state{cfg = #cfg{servers = Servers}} = State0) ->
+handle_ra_event(QName, _, timeout, #state{cfg = #cfg{servers = Servers},
+                                          leader = OldLeader,
+                                          pending = Pending} = State0) ->
     case find_leader(Servers) of
         undefined ->
+            ?LOG_DEBUG("~ts: ~s Pending applied Timeout, no leader found, num pend ~b ",
+                       [rabbit_misc:rs(QName), ?MODULE, maps:size(Pending)]),
             %% still no leader, set the timer again
             {ok, set_timer(QName, State0), []};
         Leader ->
+            ?LOG_DEBUG("~ts: ~s Pending applied Timeout ~w to ~w, "
+                       "resending ~b pending commands",
+                       [rabbit_misc:rs(QName), ?MODULE, OldLeader,
+                        Leader, maps:size(Pending)]),
             State = resend_all_pending(State0#state{leader = Leader}),
             {ok, State, []}
     end;