Merge pull request #635 from SergeTupchiy/fix-batch-processor-max-queue-size

fix(otel_batch_processor): don't divide `max_queue_size` by word-size

Author: bryannaegele

apps/opentelemetry/src/otel_batch_processor.erl

@@ -176,10 +176,7 @@ init([Args=#{reg_name := RegName}]) ->
                      exporter_config=ExporterConfig,
                      resource = Resource,
                      handed_off_table=undefined,
-                     max_queue_size=case SizeLimit of
-                                        infinity -> infinity;
-                                        _ -> SizeLimit div erlang:system_info(wordsize)
-                                    end,
+                     max_queue_size=SizeLimit,
                      exporting_timeout_ms=ExportingTimeout,
                      check_table_size_ms=CheckTableSize,
                      scheduled_delay_ms=ScheduledDelay,
@@ -193,11 +190,17 @@ callback_mode() ->
 idle(enter, _OldState, Data=#data{exporter=undefined,
                                   exporter_config=ExporterConfig,
                                   scheduled_delay_ms=SendInterval,
+                                  check_table_size_ms=CheckInterval,
                                   reg_name=RegName}) ->
     Exporter = init_exporter(RegName, ExporterConfig),
-    {keep_state, Data#data{exporter=Exporter}, [{{timeout, export_spans}, SendInterval, export_spans}]};
-idle(enter, _OldState, #data{scheduled_delay_ms=SendInterval}) ->
-    {keep_state_and_data, [{{timeout, export_spans}, SendInterval, export_spans}]};
+    {keep_state, Data#data{exporter=Exporter},
+     [{{timeout, export_spans}, SendInterval, export_spans},
+      {{timeout, check_table_size}, CheckInterval, check_table_size}]};
+idle(enter, _OldState, #data{scheduled_delay_ms=SendInterval,
+                             check_table_size_ms=CheckInterval}) ->
+    {keep_state_and_data,
+     [{{timeout, export_spans}, SendInterval, export_spans},
+      {{timeout, check_table_size}, CheckInterval, check_table_size}]};
 idle(_, export_spans, Data=#data{exporter=undefined,
                                  exporter_config=ExporterConfig,
                                  reg_name=RegName}) ->
@@ -274,15 +277,15 @@ handle_event_(_State, _, force_flush, Data) ->
 handle_event_(_State, {timeout, check_table_size}, check_table_size, #data{max_queue_size=infinity}) ->
     keep_state_and_data;
 handle_event_(_State, {timeout, check_table_size}, check_table_size, #data{max_queue_size=MaxQueueSize,
+                                                                           check_table_size_ms=CheckInterval,
                                                                            reg_name=RegName}) ->
     case ets:info(?CURRENT_TABLE(RegName), size) of
         M when M >= MaxQueueSize ->
-            disable(RegName),
-            keep_state_and_data;
+            disable(RegName);
         _ ->
-            enable(RegName),
-            keep_state_and_data
-    end;
+            enable(RegName)
+    end,
+    {keep_state_and_data, [{{timeout, check_table_size}, CheckInterval, check_table_size}]};
 handle_event_(_, {call, From}, {set_exporter, ExporterConfig}, Data=#data{exporter=OldExporter,
                                                                           reg_name=RegName}) ->
     otel_exporter:shutdown(OldExporter),

apps/opentelemetry/test/otel_batch_processor_SUITE.erl

@@ -5,17 +5,19 @@
 -include_lib("stdlib/include/assert.hrl").
 -include_lib("common_test/include/ct.hrl").
 
+-include("otel_span.hrl").
 -include_lib("opentelemetry_api/include/opentelemetry.hrl").
 
 all() ->
-    [exporting_timeout_test].
+    [exporting_timeout_test,
+     check_table_size_test].
 
 %% verifies that after the runner has to be killed for taking too long
 %% that everything is still functional and the exporter does not crash
 exporting_timeout_test(_Config) ->
     process_flag(trap_exit, true),
 
-    {ok, Pid, _} = otel_batch_processor:start_link(#{reg_name => test_processor,
+    {ok, Pid, _} = otel_batch_processor:start_link(#{name => test_processor,
                                                      resource => otel_resource:create([]),
                                                      exporter => ?MODULE,
                                                      exporting_timeout_ms => 1,
@@ -30,6 +32,34 @@ exporting_timeout_test(_Config) ->
             ok
     end.
 
+check_table_size_test(_Config) ->
+    MaxQueueSize = 10,
+    CheckTableSizeMs = 1,
+    {ok, _Pid, #{reg_name := RegName}} = otel_batch_processor:start_link(
+                                           #{name => test_processor_check_size_test,
+                                             resource => otel_resource:create([]),
+                                             exporter => ?MODULE,
+                                             exporting_timeout_ms => timer:minutes(10),
+                                             %% long enough, so that it never happens during the test
+                                             scheduled_delay_ms => timer:minutes(10),
+                                             check_table_size_ms => CheckTableSizeMs,
+                                             max_queue_size => MaxQueueSize}
+                                          ),
+    %% max_queue_size limit is not reached
+    true = otel_batch_processor:on_end(generate_span(), #{reg_name => RegName}),
+    lists:foreach(fun(_) ->
+                          otel_batch_processor:on_end(generate_span(), #{reg_name => RegName})
+                  end,
+                  lists:seq(1, MaxQueueSize)),
+    %% Wait for more than CheckTablesizeMS to be sure  check timeout occurred
+    timer:sleep(CheckTableSizeMs * 5),
+    dropped = otel_batch_processor:on_end(generate_span(), #{reg_name => RegName}),
+
+    otel_batch_processor:force_flush(#{reg_name => RegName}),
+    %% force_flush is async, have to wait for some long enough time again,
+    timer:sleep(CheckTableSizeMs * 10),
+    true = otel_batch_processor:on_end(generate_span(), #{reg_name => RegName}).
+
 %% exporter behaviour
 
 init(_) ->
@@ -40,3 +70,13 @@ export(_, _) ->
 
 shutdown(_) ->
     ok.
+
+%% helpers
+
+generate_span() ->
+    #span{trace_id = otel_id_generator:generate_trace_id(),
+          span_id = otel_id_generator:generate_span_id(),
+          name = "test_span",
+          trace_flags = 1,
+          is_recording = true,
+          instrumentation_scope = #instrumentation_scope{name = "test"}}.