Enable support to do batching using bytes sizer (open-telemetry#12751)

Signed-off-by: Bogdan Drutu <[email protected]>

Author: bogdandrutu

.chloggen/enable-bytes-batching.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: exporterhelper
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Enable support to do batching using `bytes` sizer
+
+# One or more tracking issues or pull requests related to the change
+issues: [12751]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

exporter/exporterhelper/internal/queuebatch/config.go

@@ -93,8 +93,8 @@ func (cfg *Config) Validate() error {
 	}
 
 	// Only support items sizer for batch at this moment.
-	if cfg.Batch != nil && cfg.Sizer != request.SizerTypeItems {
-		return errors.New("`batch` supports only `items` sizer")
+	if cfg.Batch != nil && (cfg.Sizer != request.SizerTypeItems && cfg.Sizer != request.SizerTypeBytes) {
+		return errors.New("`batch` supports only `items` or `bytes` sizer")
 	}
 
 	return nil

exporter/exporterhelper/internal/queuebatch/config_test.go

@@ -48,11 +48,11 @@ func TestConfig_Validate(t *testing.T) {
 
 	cfg = newTestConfig()
 	cfg.Sizer = request.SizerTypeRequests
-	require.EqualError(t, cfg.Validate(), "`batch` supports only `items` sizer")
+	require.EqualError(t, cfg.Validate(), "`batch` supports only `items` or `bytes` sizer")
 
 	cfg = newTestConfig()
 	cfg.Sizer = request.SizerTypeBytes
-	require.EqualError(t, cfg.Validate(), "`batch` supports only `items` sizer")
+	require.NoError(t, cfg.Validate())
 
 	// Confirm Validate doesn't return error with invalid config when feature is disabled
 	cfg.Enabled = false