See #7389. Only one tick process per QQ

(cherry picked from commit 9363648)

Author: SimonUnge

deps/rabbit/src/rabbit_fifo.erl

@@ -895,8 +895,7 @@ tick(Ts, #?MODULE{cfg = #cfg{name = _Name,
         true ->
             [{mod_call, rabbit_quorum_queue, spawn_deleter, [QName]}];
         false ->
-            [{mod_call, rabbit_quorum_queue,
-              handle_tick, [QName, overview(State), all_nodes(State)]}]
+            [{aux, {handle_tick, [QName, overview(State), all_nodes(State)]}}]
     end.
 
 -spec overview(state()) -> map().
@@ -979,7 +978,7 @@ which_module(3) -> ?MODULE.
                last_decorators_state :: term(),
                capacity :: term(),
                gc = #aux_gc{} :: #aux_gc{},
-               unused,
+               tick_pid,
                unused2}).
 
 init_aux(Name) when is_atom(Name) ->
@@ -1029,6 +1028,18 @@ handle_aux(leader, cast, {#return{msg_ids = MsgIds,
         _ ->
             {no_reply, Aux0, Log0}
     end;
+handle_aux(leader, _, {handle_tick, Args},
+           #?AUX{tick_pid = Pid} = Aux, Log, _) ->
+    NewPid =
+        case process_is_alive(Pid) of
+            false ->
+                %% No active TICK pid
+                spawn(rabbit_quorum_queue, handle_tick, Args);
+            true ->
+                %% Active TICK pid, do nothing
+                Pid
+        end,
+    {no_reply, Aux#?AUX{tick_pid = NewPid}, Log};
 handle_aux(_, _, {get_checked_out, ConsumerId, MsgIds},
            Aux0, Log0, #?MODULE{cfg = #cfg{},
                                 consumers = Consumers}) ->
@@ -1151,6 +1162,10 @@ force_eval_gc(Log, #?MODULE{cfg = #cfg{resource = QR}},
             AuxState
     end.
 
+process_is_alive(Pid) when is_pid(Pid) ->
+    is_process_alive(Pid);
+process_is_alive(_) ->
+    false.
 %%% Queries
 
 query_messages_ready(State) ->

deps/rabbit/test/rabbit_fifo_SUITE.erl

@@ -608,18 +608,18 @@ tick_test(C) ->
     {S3, {_, _}} = deq(C, 4, Cid2, unsettled, Msg2, S2),
     {S4, _, _} = apply(meta(C, 5), rabbit_fifo:make_return(Cid, [MsgId]), S3),
 
-    [{mod_call, rabbit_quorum_queue, handle_tick,
-      [#resource{},
-            #{config := #{name := ?FUNCTION_NAME},
-              num_consumers := 1,
-              num_checked_out := 1,
-              num_ready_messages := 1,
-              num_messages := 2,
-              enqueue_message_bytes := 3,
-              checkout_message_bytes := 3,
-              num_discarded := _Discards},
-       [_Node]
-      ]}] = rabbit_fifo:tick(1, S4),
+    [{aux, {handle_tick,
+            [#resource{},
+             #{config := #{name := ?FUNCTION_NAME},
+               num_consumers := 1,
+               num_checked_out := 1,
+               num_ready_messages := 1,
+               num_messages := 2,
+               enqueue_message_bytes := 3,
+               checkout_message_bytes := 3,
+               num_discarded := _Discards},
+             [_Node]
+            ]}}] = rabbit_fifo:tick(1, S4),
     ok.
 
 
@@ -1562,10 +1562,10 @@ purge_nodes_test(C) ->
                            {down, EnqPid, noconnection},
                            State3),
     ?assertMatch(
-       [{mod_call, rabbit_quorum_queue, handle_tick,
+       [{aux, {handle_tick,
          [#resource{}, _Metrics,
           [ThisNode, Node]
-         ]}] , rabbit_fifo:tick(1, State4)),
+         ]}}] , rabbit_fifo:tick(1, State4)),
     %% assert there are both enqueuers and consumers
     {State, _, _} = apply(meta(C, 5),
                           rabbit_fifo:make_purge_nodes([Node]),
@@ -1578,10 +1578,10 @@ purge_nodes_test(C) ->
     ?assertMatch(#rabbit_fifo{consumers = Cons} when map_size(Cons) == 0,
                                                      State),
     ?assertMatch(
-       [{mod_call, rabbit_quorum_queue, handle_tick,
+       [{aux, {handle_tick,
          [#resource{}, _Metrics,
           [ThisNode]
-         ]}] , rabbit_fifo:tick(1, State)),
+         ]}}] , rabbit_fifo:tick(1, State)),
     ok.
 
 meta(Config, Idx) ->
@@ -1765,21 +1765,21 @@ queue_ttl_test(C) ->
              expires => 1000},
     S0 = rabbit_fifo:init(Conf),
     Now = 1500,
-    [{mod_call, _, handle_tick, _}] = rabbit_fifo:tick(Now, S0),
+    [{aux, {handle_tick, [_, _, _]}}] = rabbit_fifo:tick(Now, S0),
     %% this should delete the queue
     [{mod_call, rabbit_quorum_queue, spawn_deleter, [QName]}]
         = rabbit_fifo:tick(Now + 1000, S0),
     %% adding a consumer should not ever trigger deletion
     Cid = {<<"cid1">>, self()},
     {S1, _} = check_auto(C, Cid, 1, S0),
-    [{mod_call, _, handle_tick, _}] = rabbit_fifo:tick(Now, S1),
-    [{mod_call, _, handle_tick, _}] = rabbit_fifo:tick(Now + 1000, S1),
+    [{aux, {handle_tick, [_, _, _]}}] = rabbit_fifo:tick(Now, S1),
+    [{aux, {handle_tick, [_, _, _]}}] = rabbit_fifo:tick(Now + 1000, S1),
     %% cancelling the consumer should then
     {S2, _, _} = apply(meta(C, 2, Now),
                        rabbit_fifo:make_checkout(Cid, cancel, #{}), S1),
     %% last_active should have been reset when consumer was cancelled
     %% last_active = 2500
-    [{mod_call, _, handle_tick, _}] = rabbit_fifo:tick(Now + 1000, S2),
+    [{aux, {handle_tick, [_, _, _]}}] = rabbit_fifo:tick(Now + 1000, S2),
     %% but now it should be deleted
     [{mod_call, rabbit_quorum_queue, spawn_deleter, [QName]}]
         = rabbit_fifo:tick(Now + 2500, S2),
@@ -1789,7 +1789,7 @@ queue_ttl_test(C) ->
                         {down, self(), noconnection}, S1),
     %% last_active should have been reset when consumer was cancelled
     %% last_active = 2500
-    [{mod_call, _, handle_tick, _}] = rabbit_fifo:tick(Now + 1000, S2D),
+    [{aux, {handle_tick, [_, _, _]}}] = rabbit_fifo:tick(Now + 1000, S2D),
     %% but now it should be deleted
     [{mod_call, rabbit_quorum_queue, spawn_deleter, [QName]}]
         = rabbit_fifo:tick(Now + 2500, S2D),
@@ -1800,7 +1800,7 @@ queue_ttl_test(C) ->
               rabbit_fifo:make_checkout(Cid, {dequeue, unsettled}, #{}),
               S0),
 
-    [{mod_call, _, handle_tick, _}] = rabbit_fifo:tick(Now + 1000, S1Deq),
+    [{aux, {handle_tick, [_, _, _]}}] = rabbit_fifo:tick(Now + 1000, S1Deq),
     %% but now it should be deleted
     [{mod_call, rabbit_quorum_queue, spawn_deleter, [QName]}]
         = rabbit_fifo:tick(Now + 2500, S1Deq),
@@ -1818,11 +1818,10 @@ queue_ttl_test(C) ->
       {wrap_reply, {dequeue, {MsgId, _}, _}}}] = Fun2([Msg]),
     {E3, _, _} = apply(meta(C, 3, Now + 1000),
                        rabbit_fifo:make_settle(Deq, [MsgId]), E2),
-    [{mod_call, _, handle_tick, _}] = rabbit_fifo:tick(Now + 1500, E3),
+    [{aux, {handle_tick, [_, _, _]}}] = rabbit_fifo:tick(Now + 1500, E3),
     %% but now it should be deleted
     [{mod_call, rabbit_quorum_queue, spawn_deleter, [QName]}]
         = rabbit_fifo:tick(Now + 3000, E3),
-
     ok.
 
 queue_ttl_with_single_active_consumer_test(C) ->
@@ -1834,35 +1833,33 @@ queue_ttl_with_single_active_consumer_test(C) ->
              single_active_consumer_on => true},
     S0 = rabbit_fifo:init(Conf),
     Now = 1500,
-    [{mod_call, _, handle_tick, _}] = rabbit_fifo:tick(Now, S0),
+    [{aux, {handle_tick, [_, _, _]}}] = rabbit_fifo:tick(Now, S0),
     %% this should delete the queue
     [{mod_call, rabbit_quorum_queue, spawn_deleter, [QName]}]
         = rabbit_fifo:tick(Now + 1000, S0),
     %% adding a consumer should not ever trigger deletion
     Cid = {<<"cid1">>, self()},
     {S1, _} = check_auto(C, Cid, 1, S0),
-    [{mod_call, _, handle_tick, _}] = rabbit_fifo:tick(Now, S1),
-    [{mod_call, _, handle_tick, _}] = rabbit_fifo:tick(Now + 1000, S1),
+    [{aux, {handle_tick, [_, _, _]}}] = rabbit_fifo:tick(Now, S1),
+    [{aux, {handle_tick, [_, _, _]}}] = rabbit_fifo:tick(Now + 1000, S1),
     %% cancelling the consumer should then
     {S2, _, _} = apply(meta(C, 2, Now),
                        rabbit_fifo:make_checkout(Cid, cancel, #{}), S1),
     %% last_active should have been reset when consumer was cancelled
     %% last_active = 2500
-    [{mod_call, _, handle_tick, _}] = rabbit_fifo:tick(Now + 1000, S2),
+    [{aux, {handle_tick, [_, _, _]}}] = rabbit_fifo:tick(Now + 1000, S2),
     %% but now it should be deleted
     [{mod_call, rabbit_quorum_queue, spawn_deleter, [QName]}]
         = rabbit_fifo:tick(Now + 2500, S2),
-
     %% Same for downs
     {S2D, _, _} = apply(meta(C, 2, Now),
                         {down, self(), noconnection}, S1),
     %% last_active should have been reset when consumer was cancelled
     %% last_active = 2500
-    [{mod_call, _, handle_tick, _}] = rabbit_fifo:tick(Now + 1000, S2D),
+    [{aux, {handle_tick, [_, _, _]}}] = rabbit_fifo:tick(Now + 1000, S2D),
     %% but now it should be deleted
     [{mod_call, rabbit_quorum_queue, spawn_deleter, [QName]}]
         = rabbit_fifo:tick(Now + 2500, S2D),
-
     ok.
 
 query_peek_test(C) ->