Merge pull request #6183 from rabbitmq/qq-info-optimise

QQ: don't try to contact non-connected nodes for stats

Author: michaelklishin

deps/rabbit/src/rabbit_quorum_queue.erl

@@ -203,8 +203,8 @@ start_cluster(Q) ->
                                                    ?SNAPSHOT_INTERVAL),
             RaConfs = [make_ra_conf(NewQ, ServerId, TickTimeout, SnapshotInterval)
                        || ServerId <- members(NewQ)],
-            Timeout = erpc_timeout(Leader, ?START_CLUSTER_RPC_TIMEOUT),
-            try erpc:call(Leader, ra, start_cluster, [?RA_SYSTEM, RaConfs], Timeout) of
+            try erpc_call(Leader, ra, start_cluster, [?RA_SYSTEM, RaConfs],
+                          ?START_CLUSTER_RPC_TIMEOUT) of
                 {ok, _, _} ->
                     %% ensure the latest config is evaluated properly
                     %% even when running the machine version from 0
@@ -285,17 +285,23 @@ single_active_consumer_on(Q) ->
         _            -> false
     end.
 
-update_consumer_handler(QName, {ConsumerTag, ChPid}, Exclusive, AckRequired, Prefetch, Active, ActivityStatus, Args) ->
-    local_or_remote_handler(ChPid, rabbit_quorum_queue, update_consumer,
-        [QName, ChPid, ConsumerTag, Exclusive, AckRequired, Prefetch, Active, ActivityStatus, Args]).
+update_consumer_handler(QName, {ConsumerTag, ChPid}, Exclusive, AckRequired,
+                        Prefetch, Active, ActivityStatus, Args) ->
+    catch local_or_remote_handler(ChPid, rabbit_quorum_queue, update_consumer,
+                                  [QName, ChPid, ConsumerTag, Exclusive,
+                                   AckRequired, Prefetch, Active,
+                                   ActivityStatus, Args]).
 
-update_consumer(QName, ChPid, ConsumerTag, Exclusive, AckRequired, Prefetch, Active, ActivityStatus, Args) ->
-    catch rabbit_core_metrics:consumer_updated(ChPid, ConsumerTag, Exclusive, AckRequired,
-                                               QName, Prefetch, Active, ActivityStatus, Args).
+update_consumer(QName, ChPid, ConsumerTag, Exclusive, AckRequired, Prefetch,
+                Active, ActivityStatus, Args) ->
+    catch rabbit_core_metrics:consumer_updated(ChPid, ConsumerTag, Exclusive,
+                                               AckRequired,
+                                               QName, Prefetch, Active,
+                                               ActivityStatus, Args).
 
 cancel_consumer_handler(QName, {ConsumerTag, ChPid}) ->
-    local_or_remote_handler(ChPid, rabbit_quorum_queue, cancel_consumer,
-                            [QName, ChPid, ConsumerTag]).
+    catch local_or_remote_handler(ChPid, rabbit_quorum_queue, cancel_consumer,
+                                  [QName, ChPid, ConsumerTag]).
 
 cancel_consumer(QName, ChPid, ConsumerTag) ->
     catch rabbit_core_metrics:consumer_deleted(ChPid, ConsumerTag, QName),
@@ -309,7 +315,7 @@ local_or_remote_handler(ChPid, Module, Function, Args) ->
         false ->
             %% this could potentially block for a while if the node is
             %% in disconnected state or tcp buffers are full
-            rpc:cast(Node, Module, Function, Args)
+            erpc:cast(Node, Module, Function, Args)
     end.
 
 become_leader(QName, Name) ->
@@ -329,8 +335,8 @@ become_leader(QName, Name) ->
                   case rabbit_amqqueue:lookup(QName) of
                       {ok, Q0} when ?is_amqqueue(Q0) ->
                           Nodes = get_nodes(Q0),
-                          [rpc:call(Node, ?MODULE, rpc_delete_metrics,
-                                    [QName], ?RPC_TIMEOUT)
+                          [_ = erpc_call(Node, ?MODULE, rpc_delete_metrics,
+                                         [QName], ?RPC_TIMEOUT)
                            || Node <- Nodes, Node =/= node()];
                       _ ->
                           ok
@@ -676,8 +682,8 @@ delete(Q, _IfUnused, _IfEmpty, ActingUser) when ?amqqueue_is_quorum(Q) ->
             end,
             notify_decorators(QName, shutdown),
             ok = delete_queue_data(QName, ActingUser),
-            rpc:call(LeaderNode, rabbit_core_metrics, queue_deleted, [QName],
-                     ?RPC_TIMEOUT),
+            _ = erpc:call(LeaderNode, rabbit_core_metrics, queue_deleted, [QName],
+                          ?RPC_TIMEOUT),
             {ok, ReadyMsgs};
         {error, {no_more_servers_to_try, Errs}} ->
             case lists:all(fun({{error, noproc}, _}) -> true;
@@ -971,9 +977,8 @@ cleanup_data_dir() ->
              end
              || Q <- rabbit_amqqueue:list_by_type(?MODULE),
                 lists:member(node(), get_nodes(Q))],
-    NoQQClusters = rabbit_ra_registry:list_not_quorum_clusters(),
     Registered = ra_directory:list_registered(?RA_SYSTEM),
-    Running = Names ++ NoQQClusters,
+    Running = Names,
     _ = [maybe_delete_data_dir(UId) || {Name, UId} <- Registered,
                                        not lists:member(Name, Running)],
     ok.
@@ -1436,9 +1441,11 @@ i(memory, Q) when ?is_amqqueue(Q) ->
 i(state, Q) when ?is_amqqueue(Q) ->
     {Name, Node} = amqqueue:get_pid(Q),
     %% Check against the leader or last known leader
-    case rpc:call(Node, ?MODULE, cluster_state, [Name], ?RPC_TIMEOUT) of
-        {badrpc, _} -> down;
-        State -> State
+    case erpc_call(Node, ?MODULE, cluster_state, [Name], ?RPC_TIMEOUT) of
+        {error, _} ->
+            down;
+        State ->
+            State
     end;
 i(local_state, Q) when ?is_amqqueue(Q) ->
     {Name, _} = amqqueue:get_pid(Q),
@@ -1457,7 +1464,7 @@ i(online, Q) -> online(Q);
 i(leader, Q) -> leader(Q);
 i(open_files, Q) when ?is_amqqueue(Q) ->
     {Name, _} = amqqueue:get_pid(Q),
-    Nodes = get_nodes(Q),
+    Nodes = get_connected_nodes(Q),
     {Data, _} = rpc:multicall(Nodes, ?MODULE, open_files, [Name]),
     lists:flatten(Data);
 i(single_active_consumer_pid, Q) when ?is_amqqueue(Q) ->
@@ -1559,7 +1566,7 @@ peek(_Pos, Q) when ?is_amqqueue(Q) andalso ?amqqueue_is_classic(Q) ->
     {error, classic_queue_not_supported}.
 
 online(Q) when ?is_amqqueue(Q) ->
-    Nodes = get_nodes(Q),
+    Nodes = get_connected_nodes(Q),
     {Name, _} = amqqueue:get_pid(Q),
     [Node || Node <- Nodes, is_process_alive(Name, Node)].
 
@@ -1568,7 +1575,10 @@ format(Q) when ?is_amqqueue(Q) ->
     [{members, Nodes}, {online, online(Q)}, {leader, leader(Q)}].
 
 is_process_alive(Name, Node) ->
-    erlang:is_pid(rpc:call(Node, erlang, whereis, [Name], ?RPC_TIMEOUT)).
+    %% don't attempt rpc if node is not already connected
+    %% as this function is used for metrics and stats and the additional
+    %% latency isn't warranted
+    erlang:is_pid(erpc_call(Node, erlang, whereis, [Name], ?RPC_TIMEOUT)).
 
 -spec quorum_messages(rabbit_amqqueue:name()) -> non_neg_integer().
 
@@ -1626,6 +1636,10 @@ get_nodes(Q) when ?is_amqqueue(Q) ->
     #{nodes := Nodes} = amqqueue:get_type_state(Q),
     Nodes.
 
+get_connected_nodes(Q) when ?is_amqqueue(Q) ->
+    ErlangNodes = [node() | nodes()],
+    [N || N <- get_nodes(Q), lists:member(N, ErlangNodes)].
+
 update_type_state(Q, Fun) when ?is_amqqueue(Q) ->
     Ts = amqqueue:get_type_state(Q),
     amqqueue:set_type_state(Q, Fun(Ts)).
@@ -1691,18 +1705,37 @@ prepare_content(Content) ->
     %% rabbit_fifo can directly parse it without having to decode again.
     Content.
 
-erpc_timeout(Node, _)
-  when Node =:= node() ->
-    %% Only timeout 'infinity' optimises the local call in OTP 23-25 avoiding a new process being spawned:
-    %% https://github.com/erlang/otp/blob/47f121af8ee55a0dbe2a8c9ab85031ba052bad6b/lib/kernel/src/erpc.erl#L121
-    infinity;
-erpc_timeout(_, Timeout) ->
-    Timeout.
-
 ets_lookup_element(Tbl, Key, Pos, Default) ->
     try ets:lookup_element(Tbl, Key, Pos) of
         V -> V
     catch
         _:badarg ->
             Default
     end.
+
+erpc_call(Node, M, F, A, Timeout)
+  when is_integer(Timeout) andalso Node == node()  ->
+    %% Only timeout 'infinity' optimises the local call in OTP 23-25 avoiding a new process being spawned:
+    %% https://github.com/erlang/otp/blob/47f121af8ee55a0dbe2a8c9ab85031ba052bad6b/lib/kernel/src/erpc.erl#L121
+    try erpc:call(Node, M, F, A, Timeout) of
+        Result ->
+            Result
+    catch
+        error:Err ->
+            {error, Err}
+    end;
+erpc_call(Node, M, F, A, Timeout) ->
+    case lists:member(Node, nodes()) of
+        true ->
+            try erpc:call(Node, M, F, A, Timeout) of
+                Result ->
+                    Result
+            catch
+                error:Err ->
+                    {error, Err}
+            end;
+        false ->
+            {error, noconnection}
+    end.
+
+

deps/rabbit/test/quorum_queue_SUITE.erl

@@ -1705,7 +1705,7 @@ add_member(Config) ->
     ok = rabbit_control_helper:command(stop_app, Server1),
     ok = rabbit_control_helper:command(join_cluster, Server1, [atom_to_list(Server0)], []),
     rabbit_control_helper:command(start_app, Server1),
-    ?assertEqual(ok, rpc:call(Server0, rabbit_quorum_queue, add_member,
+    ?assertEqual(ok, rpc:call(Server1, rabbit_quorum_queue, add_member,
                               [<<"/">>, QQ, Server1, 5000])),
     Info = rpc:call(Server0, rabbit_quorum_queue, infos,
                     [rabbit_misc:r(<<"/">>, queue, QQ)]),