add repl_mon chech in async mode (#111)

Co-authored-by: suetin <[email protected]>

internal/app/app.go

@@ -758,9 +758,11 @@ func (app *App) stateManager() appState {
 		app.logger.Errorf("failed to update active nodes in dcs: %v", err)
 	}
 
-	err = app.updateReplMonTS(master)
-	if err != nil {
-		app.logger.Errorf("failed to update repl_mon timestamp: %v", err)
+	if app.config.ReplMon {
+		err = app.updateReplMonTS(master)
+		if err != nil {
+			app.logger.Errorf("failed to update repl_mon timestamp: %v", err)
+		}
 	}
 
 	return stateManager

internal/config/config.go

@@ -224,5 +224,8 @@ func (cfg *Config) Validate() error {
 	if cfg.SemiSync && cfg.ASync {
 		return fmt.Errorf("can't run in both semisync and async mode")
 	}
+	if cfg.ASync && !cfg.ReplMon {
+		return fmt.Errorf("repl mon must be enabled to run mysync in async mode")
+	}
 	return nil
 }