feat(buffer_worker): refactor buffer/resource workers to always use queue and use offload mode

Makefile

@@ -88,6 +88,7 @@ define gen-app-ct-target
 $1-ct: $(REBAR)
 	@$(SCRIPTS)/pre-compile.sh $(PROFILE)
 	@ENABLE_COVER_COMPILE=1 $(REBAR) ct -c -v \
+	        --readable=$(CT_READABLE) \
 		--name $(CT_NODE_NAME) \
 		--cover_export_name $(CT_COVER_EXPORT_PREFIX)-$(subst /,-,$1) \
 		--suite $(shell $(SCRIPTS)/find-suites.sh $1)

apps/emqx/test/emqx_common_test_helpers.erl

@@ -447,8 +447,11 @@ is_all_tcp_servers_available(Servers) ->
             is_tcp_server_available(Host, Port)
         end,
     case lists:partition(Fun, Servers) of
-        {_, []} -> true;
-        {_, Unavail} -> ct:print("Unavailable servers: ~p", [Unavail])
+        {_, []} ->
+            true;
+        {_, Unavail} ->
+            ct:print("Unavailable servers: ~p", [Unavail]),
+            false
     end.
 
 -spec is_tcp_server_available(

apps/emqx_bridge/i18n/emqx_bridge_schema.conf

@@ -78,17 +78,6 @@ emqx_bridge_schema {
                           }
                   }
 
-    metric_batching {
-                   desc {
-                         en: """Count of messages that are currently accumulated in memory waiting for sending in one batch."""
-                         zh: """当前积压在内存里，等待批量发送的消息个数"""
-                        }
-                   label: {
-                           en: "Batched"
-                           zh: "等待批量发送"
-                          }
-                  }
-
     metric_dropped {
                    desc {
                          en: """Count of messages dropped."""
@@ -120,16 +109,6 @@ emqx_bridge_schema {
                            zh: "队列已满被丢弃"
                           }
                   }
-    metric_dropped_queue_not_enabled {
-                   desc {
-                         en: """Count of messages dropped due to the queue is not enabled."""
-                         zh: """因为队列未启用被丢弃的消息个数。"""
-                        }
-                   label: {
-                           en: "Dropped Queue Disabled"
-                           zh: "队列未启用被丢弃"
-                          }
-                  }
     metric_dropped_resource_not_found {
                    desc {
                          en: """Count of messages dropped due to the resource is not found."""
@@ -193,7 +172,7 @@ emqx_bridge_schema {
                           }
                   }
 
-    metric_sent_inflight {
+    metric_inflight {
                    desc {
                          en: """Count of messages that were sent asynchronously but ACKs are not yet received."""
                          zh: """已异步地发送但没有收到 ACK 的消息个数。"""

apps/emqx_bridge/include/emqx_bridge.hrl

@@ -16,16 +16,14 @@
 
 -define(EMPTY_METRICS,
     ?METRICS(
-        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
     )
 ).
 
 -define(METRICS(
-    Batched,
     Dropped,
     DroppedOther,
     DroppedQueueFull,
-    DroppedQueueNotEnabled,
     DroppedResourceNotFound,
     DroppedResourceStopped,
     Matched,
@@ -40,11 +38,9 @@
     Rcvd
 ),
     #{
-        'batching' => Batched,
         'dropped' => Dropped,
         'dropped.other' => DroppedOther,
         'dropped.queue_full' => DroppedQueueFull,
-        'dropped.queue_not_enabled' => DroppedQueueNotEnabled,
         'dropped.resource_not_found' => DroppedResourceNotFound,
         'dropped.resource_stopped' => DroppedResourceStopped,
         'matched' => Matched,
@@ -61,11 +57,9 @@
 ).
 
 -define(metrics(
-    Batched,
     Dropped,
     DroppedOther,
     DroppedQueueFull,
-    DroppedQueueNotEnabled,
     DroppedResourceNotFound,
     DroppedResourceStopped,
     Matched,
@@ -80,11 +74,9 @@
     Rcvd
 ),
     #{
-        'batching' := Batched,
         'dropped' := Dropped,
         'dropped.other' := DroppedOther,
         'dropped.queue_full' := DroppedQueueFull,
-        'dropped.queue_not_enabled' := DroppedQueueNotEnabled,
         'dropped.resource_not_found' := DroppedResourceNotFound,
         'dropped.resource_stopped' := DroppedResourceStopped,
         'matched' := Matched,

apps/emqx_bridge/src/emqx_bridge_api.erl

@@ -207,7 +207,6 @@ info_example_basic(webhook) ->
             auto_restart_interval => 15000,
             query_mode => async,
             async_inflight_window => 100,
-            enable_queue => false,
             max_queue_bytes => 100 * 1024 * 1024
         }
     };
@@ -233,7 +232,6 @@ mqtt_main_example() ->
             health_check_interval => <<"15s">>,
             auto_restart_interval => <<"60s">>,
             query_mode => sync,
-            enable_queue => false,
             max_queue_bytes => 100 * 1024 * 1024
         },
         ssl => #{
@@ -634,11 +632,11 @@ aggregate_metrics(AllMetrics) ->
         fun(
             #{
                 metrics := ?metrics(
-                    M1, M2, M3, M4, M5, M6, M7, M8, M9, M10, M11, M12, M13, M14, M15, M16, M17
+                    M1, M2, M3, M4, M5, M6, M7, M8, M9, M10, M11, M12, M13, M14, M15
                 )
             },
             ?metrics(
-                N1, N2, N3, N4, N5, N6, N7, N8, N9, N10, N11, N12, N13, N14, N15, N16, N17
+                N1, N2, N3, N4, N5, N6, N7, N8, N9, N10, N11, N12, N13, N14, N15
             )
         ) ->
             ?METRICS(
@@ -656,9 +654,7 @@ aggregate_metrics(AllMetrics) ->
                 M12 + N12,
                 M13 + N13,
                 M14 + N14,
-                M15 + N15,
-                M16 + N16,
-                M17 + N17
+                M15 + N15
             )
         end,
         InitMetrics,
@@ -691,7 +687,6 @@ format_metrics(#{
         'dropped' := Dropped,
         'dropped.other' := DroppedOther,
         'dropped.queue_full' := DroppedQueueFull,
-        'dropped.queue_not_enabled' := DroppedQueueNotEnabled,
         'dropped.resource_not_found' := DroppedResourceNotFound,
         'dropped.resource_stopped' := DroppedResourceStopped,
         'matched' := Matched,
@@ -705,15 +700,12 @@ format_metrics(#{
         matched := #{current := Rate, last5m := Rate5m, max := RateMax}
     }
 }) ->
-    Batched = maps:get('batching', Gauges, 0),
     Queued = maps:get('queuing', Gauges, 0),
     SentInflight = maps:get('inflight', Gauges, 0),
     ?METRICS(
-        Batched,
         Dropped,
         DroppedOther,
         DroppedQueueFull,
-        DroppedQueueNotEnabled,
         DroppedResourceNotFound,
         DroppedResourceStopped,
         Matched,

apps/emqx_bridge/src/schema/emqx_bridge_mqtt_config.erl

@@ -82,7 +82,6 @@ default_resource_opts() ->
     #{
         <<"async_inflight_window">> => 100,
         <<"auto_restart_interval">> => <<"60s">>,
-        <<"enable_queue">> => false,
         <<"health_check_interval">> => <<"15s">>,
         <<"max_queue_bytes">> => <<"1GB">>,
         <<"query_mode">> => <<"sync">>,

apps/emqx_bridge/src/schema/emqx_bridge_schema.erl

@@ -128,12 +128,9 @@ fields(bridges) ->
     ] ++ ee_fields_bridges();
 fields("metrics") ->
     [
-        {"batching", mk(integer(), #{desc => ?DESC("metric_batching")})},
         {"dropped", mk(integer(), #{desc => ?DESC("metric_dropped")})},
         {"dropped.other", mk(integer(), #{desc => ?DESC("metric_dropped_other")})},
         {"dropped.queue_full", mk(integer(), #{desc => ?DESC("metric_dropped_queue_full")})},
-        {"dropped.queue_not_enabled",
-            mk(integer(), #{desc => ?DESC("metric_dropped_queue_not_enabled")})},
         {"dropped.resource_not_found",
             mk(integer(), #{desc => ?DESC("metric_dropped_resource_not_found")})},
         {"dropped.resource_stopped",
@@ -142,7 +139,7 @@ fields("metrics") ->
         {"queuing", mk(integer(), #{desc => ?DESC("metric_queuing")})},
         {"retried", mk(integer(), #{desc => ?DESC("metric_retried")})},
         {"failed", mk(integer(), #{desc => ?DESC("metric_sent_failed")})},
-        {"inflight", mk(integer(), #{desc => ?DESC("metric_sent_inflight")})},
+        {"inflight", mk(integer(), #{desc => ?DESC("metric_inflight")})},
         {"success", mk(integer(), #{desc => ?DESC("metric_sent_success")})},
         {"rate", mk(float(), #{desc => ?DESC("metric_rate")})},
         {"rate_max", mk(float(), #{desc => ?DESC("metric_rate_max")})},

apps/emqx_bridge/test/emqx_bridge_mqtt_SUITE.erl

@@ -662,7 +662,6 @@ t_mqtt_conn_bridge_egress_reconnect(_) ->
             <<"reconnect_interval">> => <<"1s">>,
             <<"resource_opts">> => #{
                 <<"worker_pool_size">> => 2,
-                <<"enable_queue">> => true,
                 <<"query_mode">> => <<"sync">>,
                 %% to make it check the healthy quickly
                 <<"health_check_interval">> => <<"0.5s">>

apps/emqx_resource/i18n/emqx_resource_schema_i18n.conf

@@ -126,8 +126,8 @@ When disabled the messages are buffered in RAM only."""
 
   batch_size {
     desc {
-      en: """Maximum batch count."""
-      zh: """批量请求大小。"""
+      en: """Maximum batch count. If equal to 1, there's effectively no batching."""
+      zh: """批量请求大小。如果设为1，则无批处理。"""
     }
     label {
       en: """Batch size"""

apps/emqx_resource/include/emqx_resource.hrl

@@ -64,10 +64,8 @@
     %% If the resource disconnected, we can set to retry starting the resource
     %% periodically.
     auto_restart_interval => pos_integer(),
-    enable_batch => boolean(),
     batch_size => pos_integer(),
     batch_time => pos_integer(),
-    enable_queue => boolean(),
     max_queue_bytes => pos_integer(),
     query_mode => query_mode(),
     resume_interval => pos_integer(),
@@ -90,7 +88,7 @@
 -define(DEFAULT_QUEUE_SIZE_RAW, <<"100MB">>).
 
 %% count
--define(DEFAULT_BATCH_SIZE, 100).
+-define(DEFAULT_BATCH_SIZE, 1).
 
 %% milliseconds
 -define(DEFAULT_BATCH_TIME, 20).

apps/emqx_resource/src/emqx_resource_manager.erl

@@ -136,7 +136,6 @@ create(MgrId, ResId, Group, ResourceType, Config, Opts) ->
             'success',
             'failed',
             'dropped',
-            'dropped.queue_not_enabled',
             'dropped.queue_full',
             'dropped.resource_not_found',
             'dropped.resource_stopped',

apps/emqx_resource/src/emqx_resource_metrics.erl

@@ -24,9 +24,6 @@
 ]).
 
 -export([
-    batching_set/3,
-    batching_shift/3,
-    batching_get/1,
     inflight_set/3,
     inflight_get/1,
     queuing_set/3,
@@ -40,9 +37,6 @@
     dropped_queue_full_inc/1,
     dropped_queue_full_inc/2,
     dropped_queue_full_get/1,
-    dropped_queue_not_enabled_inc/1,
-    dropped_queue_not_enabled_inc/2,
-    dropped_queue_not_enabled_get/1,
     dropped_resource_not_found_inc/1,
     dropped_resource_not_found_inc/2,
     dropped_resource_not_found_get/1,
@@ -80,10 +74,8 @@ events() ->
     [
         [?TELEMETRY_PREFIX, Event]
      || Event <- [
-            batching,
             dropped_other,
             dropped_queue_full,
-            dropped_queue_not_enabled,
             dropped_resource_not_found,
             dropped_resource_stopped,
             failed,
@@ -125,9 +117,6 @@ handle_telemetry_event(
         dropped_queue_full ->
             emqx_metrics_worker:inc(?RES_METRICS, ID, 'dropped', Val),
             emqx_metrics_worker:inc(?RES_METRICS, ID, 'dropped.queue_full', Val);
-        dropped_queue_not_enabled ->
-            emqx_metrics_worker:inc(?RES_METRICS, ID, 'dropped', Val),
-            emqx_metrics_worker:inc(?RES_METRICS, ID, 'dropped.queue_not_enabled', Val);
         dropped_resource_not_found ->
             emqx_metrics_worker:inc(?RES_METRICS, ID, 'dropped', Val),
             emqx_metrics_worker:inc(?RES_METRICS, ID, 'dropped.resource_not_found', Val);
@@ -160,54 +149,19 @@ handle_telemetry_event(
     _HandlerConfig
 ) ->
     case Event of
-        batching ->
-            emqx_metrics_worker:set_gauge(?RES_METRICS, ID, WorkerID, 'batching', Val);
         inflight ->
             emqx_metrics_worker:set_gauge(?RES_METRICS, ID, WorkerID, 'inflight', Val);
         queuing ->
             emqx_metrics_worker:set_gauge(?RES_METRICS, ID, WorkerID, 'queuing', Val);
         _ ->
             ok
     end;
-handle_telemetry_event(
-    [?TELEMETRY_PREFIX, Event],
-    _Measurements = #{gauge_shift := Val},
-    _Metadata = #{resource_id := ID, worker_id := WorkerID},
-    _HandlerConfig
-) ->
-    case Event of
-        batching ->
-            emqx_metrics_worker:shift_gauge(?RES_METRICS, ID, WorkerID, 'batching', Val);
-        _ ->
-            ok
-    end;
 handle_telemetry_event(_EventName, _Measurements, _Metadata, _HandlerConfig) ->
     ok.
 
 %% Gauges (value can go both up and down):
 %% --------------------------------------
 
-%% @doc Count of messages that are currently accumulated in memory waiting for
-%% being sent in one batch
-batching_set(ID, WorkerID, Val) ->
-    telemetry:execute(
-        [?TELEMETRY_PREFIX, batching],
-        #{gauge_set => Val},
-        #{resource_id => ID, worker_id => WorkerID}
-    ).
-
-batching_shift(_ID, _WorkerID = undefined, _Val) ->
-    ok;
-batching_shift(ID, WorkerID, Val) ->
-    telemetry:execute(
-        [?TELEMETRY_PREFIX, batching],
-        #{gauge_shift => Val},
-        #{resource_id => ID, worker_id => WorkerID}
-    ).
-
-batching_get(ID) ->
-    emqx_metrics_worker:get_gauge(?RES_METRICS, ID, 'batching').
-
 %% @doc Count of batches of messages that are currently
 %% queuing. [Gauge]
 queuing_set(ID, WorkerID, Val) ->
@@ -269,18 +223,6 @@ dropped_queue_full_inc(ID, Val) ->
 dropped_queue_full_get(ID) ->
     emqx_metrics_worker:get(?RES_METRICS, ID, 'dropped.queue_full').
 
-%% @doc Count of messages dropped because the queue was not enabled
-dropped_queue_not_enabled_inc(ID) ->
-    dropped_queue_not_enabled_inc(ID, 1).
-
-dropped_queue_not_enabled_inc(ID, Val) ->
-    telemetry:execute([?TELEMETRY_PREFIX, dropped_queue_not_enabled], #{counter_inc => Val}, #{
-        resource_id => ID
-    }).
-
-dropped_queue_not_enabled_get(ID) ->
-    emqx_metrics_worker:get(?RES_METRICS, ID, 'dropped.queue_not_enabled').
-
 %% @doc Count of messages dropped because the resource was not found
 dropped_resource_not_found_inc(ID) ->
     dropped_resource_not_found_inc(ID, 1).