Add validation error when queue_size smaller than batch.min_size (#12949)

<!-- Issue number if applicable -->
#### Link to tracking issue
Fixes #12948

Signed-off-by: Israel Blancas <[email protected]>

Author: iblancasa

.chloggen/12948.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: bug_fix
+
+# 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: "Add validation error for batch config if min_size is greater than queue_size."
+
+# One or more tracking issues or pull requests related to the change
+issues: [12948]
+
+# (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: []

exporter/exporterhelper/internal/queuebatch/config.go

@@ -92,9 +92,16 @@ func (cfg *Config) Validate() error {
 		return errors.New("persistent queue configured with `storage` only supports `requests` sizer")
 	}
 
-	// Only support items sizer for batch at this moment.
-	if cfg.Batch != nil && (cfg.Sizer != request.SizerTypeItems && cfg.Sizer != request.SizerTypeBytes) {
-		return errors.New("`batch` supports only `items` or `bytes` sizer")
+	if cfg.Batch != nil {
+		// Only support items or bytes sizer for batch at this moment.
+		if cfg.Sizer != request.SizerTypeItems && cfg.Sizer != request.SizerTypeBytes {
+			return errors.New("`batch` supports only `items` or `bytes` sizer")
+		}
+
+		// Avoid situations where the queue is not able to hold any data.
+		if cfg.Batch.MinSize > cfg.QueueSize {
+			return errors.New("`min_size` must be less than or equal to `queue_size`")
+		}
 	}
 
 	return nil

exporter/exporterhelper/internal/queuebatch/config_test.go

@@ -50,6 +50,10 @@ func TestConfig_Validate(t *testing.T) {
 	cfg.Sizer = request.SizerTypeRequests
 	require.EqualError(t, cfg.Validate(), "`batch` supports only `items` or `bytes` sizer")
 
+	cfg = newTestConfig()
+	cfg.QueueSize = cfg.Batch.MinSize - 1
+	require.EqualError(t, cfg.Validate(), "`min_size` must be less than or equal to `queue_size`")
+
 	cfg = newTestConfig()
 	cfg.Sizer = request.SizerTypeBytes
 	require.NoError(t, cfg.Validate())