config: add warning, when users set configuration to mydumper/loader/syncer b…

dm/config/task.go

@@ -476,6 +476,9 @@ func (c *TaskConfig) adjust() error {
 			*inst.Mydumper = *rule // ref mydumper config
 		}
 		if inst.Mydumper == nil {
+			if len(c.Mydumpers) != 0 {
+				log.L().Warn("mysql instance don't refer mydumper's configuration with mydumper-config-name, the default configuration will be used", zap.Int("mysql instance", i))
+			}
 			defaultCfg := defaultMydumperConfig()
 			inst.Mydumper = &defaultCfg
 		} else if inst.Mydumper.ChunkFilesize == "" {
@@ -500,6 +503,9 @@ func (c *TaskConfig) adjust() error {
 			*inst.Loader = *rule // ref loader config
 		}
 		if inst.Loader == nil {
+			if len(c.Loaders) != 0 {
+				log.L().Warn("mysql instance don't refer loader's configuration with loader-config-name, the default configuration will be used", zap.Int("mysql instance", i))
+			}
 			defaultCfg := defaultLoaderConfig()
 			inst.Loader = &defaultCfg
 		}
@@ -516,6 +522,9 @@ func (c *TaskConfig) adjust() error {
 			*inst.Syncer = *rule // ref syncer config
 		}
 		if inst.Syncer == nil {
+			if len(c.Syncers) != 0 {
+				log.L().Warn("mysql instance don't refer syncer's configuration with syncer-config-name, the default configuration will be used", zap.Int("mysql instance", i))
+			}
 			defaultCfg := defaultSyncerConfig()
 			inst.Syncer = &defaultCfg
 		}