forget_cluster_node: delete all local classic queues when using Khepri store

deps/rabbit/src/rabbit_amqqueue.erl

@@ -1819,6 +1819,7 @@ internal_delete(Queue, ActingUser, Reason) ->
 %% TODO this is used by `rabbit_mnesia:remove_node_if_mnesia_running`
 %% Does it make any sense once mnesia is not used/removed?
 forget_all_durable(Node) ->
+    rabbit_log:info("Will remove all classic queues from node ~ts. The node is likely being removed from the cluster.", [Node]),
     UpdateFun = fun(Q) ->
                         forget_node_for_queue(Q)
                 end,

deps/rabbit/src/rabbit_khepri.erl

@@ -538,6 +538,7 @@ remove_reachable_member(NodeToRemove) ->
             NodeToRemove, khepri_cluster, reset, [?RA_CLUSTER_NAME]),
     case Ret of
         ok ->
+            rabbit_amqqueue:forget_all_durable(NodeToRemove),
             ?LOG_DEBUG(
                "Node ~s removed from Khepri cluster \"~s\"",
                [NodeToRemove, ?RA_CLUSTER_NAME],
@@ -559,6 +560,7 @@ remove_down_member(NodeToRemove) ->
     Ret = ra:remove_member(ServerRef, ServerId, Timeout),
     case Ret of
         {ok, _, _} ->
+            rabbit_amqqueue:forget_all_durable(NodeToRemove),
             ?LOG_DEBUG(
                "Node ~s removed from Khepri cluster \"~s\"",
                [NodeToRemove, ?RA_CLUSTER_NAME],

deps/rabbit/test/cli_forget_cluster_node_SUITE.erl

@@ -37,7 +37,8 @@ groups() ->
                            forget_cluster_node_with_all_last_streams,
                            forget_cluster_node_with_quorum_queues_and_streams,
                            forget_cluster_node_with_one_last_quorum_member_and_streams,
-                           forget_cluster_node_with_one_last_stream_and_quorum_queues
+                           forget_cluster_node_with_one_last_stream_and_quorum_queues,
+                           forget_cluster_node_with_one_classic_queue
                           ]}
     ].
 
@@ -354,6 +355,30 @@ forget_cluster_node_with_one_last_stream_and_quorum_queues(Config) ->
     ?awaitMatch(Members when length(Members) == 2, get_quorum_members(Rabbit, QQ1), 30000),
     ?awaitMatch(Members when length(Members) == 2, get_quorum_members(Rabbit, QQ2), 30000).
 
+forget_cluster_node_with_one_classic_queue(Config) ->
+    [Rabbit, Hare, Bunny] = rabbit_ct_broker_helpers:get_node_configs(Config, nodename),
+
+    assert_clustered([Rabbit, Hare, Bunny]),
+
+    Ch = rabbit_ct_client_helpers:open_channel(Config, Bunny),
+    CQ1 = <<"classic-queue-1">>,
+    declare(Ch, CQ1, [{<<"x-queue-type">>, longstr, <<"classic">>}]),
+
+    ?awaitMatch([_], rabbit_ct_broker_helpers:rabbitmqctl_list(
+                       Config, Rabbit,
+                       ["list_queues", "name", "--no-table-headers"]),
+                30000),
+
+    ?assertEqual(ok, rabbit_control_helper:command(stop_app, Bunny)),
+    ?assertEqual(ok, forget_cluster_node(Rabbit, Bunny)),
+
+    assert_cluster_status({[Rabbit, Hare], [Rabbit, Hare], [Rabbit, Hare]},
+                          [Rabbit, Hare]),
+    ?awaitMatch([], rabbit_ct_broker_helpers:rabbitmqctl_list(
+                      Config, Rabbit,
+                      ["list_queues", "name", "--no-table-headers"]),
+                30000).
+
 forget_cluster_node(Node, Removee) ->
     rabbit_control_helper:command(forget_cluster_node, Node, [atom_to_list(Removee)],
                                   []).