Merge branch 'stable'

2 files changed, 18 insertions, 8 deletions

diff --git a/src/rabbit.erl b/src/rabbit.erl
index cc1e0e08c4..0d0ff2f9fc 100644
--- a/src/rabbit.erl
+++ b/src/rabbit.erl
@@ -23,6 +23,7 @@
          status/0, is_running/0, alarms/0,
          is_running/1, environment/0, rotate_logs/0, force_event_refresh/1,
          start_fhc/0]).
+
 -export([start/2, stop/1, prep_stop/1]).
 -export([start_apps/1, start_apps/2, stop_apps/1]).
 -export([log_locations/0, config_files/0, decrypt_config/2]). %% for testing and mgmt-agent
@@ -230,6 +231,7 @@
 
 %%----------------------------------------------------------------------------
 
+-type restart_type() :: 'permanent' | 'transient' | 'temporary'.
 %% this really should be an abstract type
 -type log_location() :: string().
 -type param() :: atom().
@@ -267,7 +269,7 @@
 -spec recover() -> 'ok'.
 -spec start_apps([app_name()]) -> 'ok'.
 -spec start_apps([app_name()],
-                 #{app_name() => permanent|transient|temporary}) -> 'ok'.
+                 #{app_name() => restart_type()}) -> 'ok'.
 -spec stop_apps([app_name()]) -> 'ok'.
 
 %%----------------------------------------------------------------------------
@@ -506,7 +508,7 @@ stop_and_halt() ->
 start_apps(Apps) ->
     start_apps(Apps, #{}).
 
-start_apps(Apps, AppModes) ->
+start_apps(Apps, RestartTypes) ->
     app_utils:load_applications(Apps),
 
     ConfigEntryDecoder = case application:get_env(rabbit, config_entry_decoder) of
@@ -547,7 +549,7 @@ start_apps(Apps, AppModes) ->
     end,
     ok = app_utils:start_applications(OrderedApps,
                                       handle_app_error(could_not_start),
-                                      AppModes).
+                                      RestartTypes).
 
 %% This function retrieves the correct IoDevice for requesting
 %% input. The problem with using the default IoDevice is that
diff --git a/src/rabbit_amqqueue_process.erl b/src/rabbit_amqqueue_process.erl
index 80e36025d8..bdb7da1de2 100644
--- a/src/rabbit_amqqueue_process.erl
+++ b/src/rabbit_amqqueue_process.erl
@@ -22,6 +22,7 @@
 
 -define(SYNC_INTERVAL,                 200). %% milliseconds
 -define(RAM_DURATION_UPDATE_INTERVAL, 5000).
+-define(CONSUMER_BIAS_RATIO,           2.0). %% i.e. consume 100% faster
 
 -export([info_keys/0]).
 
@@ -1013,18 +1014,18 @@ emit_consumer_deleted(ChPid, ConsumerTag, QName, ActingUser) ->
 
 %%----------------------------------------------------------------------------
 
-prioritise_call(Msg, _From, _Len, _State) ->
+prioritise_call(Msg, _From, _Len, State) ->
     case Msg of
         info                                       -> 9;
         {info, _Items}                             -> 9;
         consumers                                  -> 9;
         stat                                       -> 7;
-        {basic_consume, _, _, _, _, _, _, _, _, _, _} -> 1;
-        {basic_cancel, _, _, _}                       -> 1;
+        {basic_consume, _, _, _, _, _, _, _, _, _} -> consumer_bias(State, 0, 2);
+        {basic_cancel, _, _, _}                    -> consumer_bias(State, 0, 2);
         _                                          -> 0
     end.
 
-prioritise_cast(Msg, _Len, _State) ->
+prioritise_cast(Msg, _Len, State) ->
     case Msg of
         delete_immediately                   -> 8;
         {delete_exclusive, _Pid}             -> 8;
@@ -1033,7 +1034,7 @@ prioritise_cast(Msg, _Len, _State) ->
         {run_backing_queue, _Mod, _Fun}      -> 6;
         {ack, _AckTags, _ChPid}              -> 4; %% [1]
         {resume, _ChPid}                     -> 3;
-        {notify_sent, _ChPid, _Credit}       -> 2;
+        {notify_sent, _ChPid, _Credit}       -> consumer_bias(State, 0, 2);
         _                                    -> 0
     end.
 
@@ -1049,6 +1050,13 @@ prioritise_cast(Msg, _Len, _State) ->
 %% credit to self is hard to reason about. Consumers can continue while
 %% reduce_memory_use is in progress.
 
+consumer_bias(#q{backing_queue = BQ, backing_queue_state = BQS}, Low, High) ->
+    case BQ:msg_rates(BQS) of
+        {0.0,          _} -> Low;
+        {Ingress, Egress} when Egress / Ingress < ?CONSUMER_BIAS_RATIO -> High;
+        {_,            _} -> Low
+    end.
+
 prioritise_info(Msg, _Len, #q{q = #amqqueue{exclusive_owner = DownPid}}) ->
     case Msg of
         {'DOWN', _, process, DownPid, _}     -> 8;