diff --git a/client/operation.go b/client/operation.go
index 19a9dfb..5d2452e 100644
--- a/client/operation.go
+++ b/client/operation.go
@@ -236,6 +236,7 @@ func (hc *houstonClient) launch(meta *procmeta) error {
 		metricValues := make(map[string]metricValueAccessor)
 
 		defer func() {
+			logger.Println("stdReader is terminated :", meta.name)
 			if meta.isState(protos.ProcessState_Running) {
 				hc.operationChan <- &protos.OperationQueryResponse{
 					Operation: string(shared.Exception),
@@ -249,6 +250,7 @@ func (hc *houstonClient) launch(meta *procmeta) error {
 		for {
 			buff, err := reader.ReadBytes('\n')
 			if err != nil {
+				logger.Println("ReadBytes at stdReader return err :", err, meta.name)
 				break
 			}
 
@@ -260,10 +262,8 @@ func (hc *houstonClient) launch(meta *procmeta) error {
 			}
 
 			if readingMetric {
-				logger.Println("readingMetric is on :", string(buff))
 				if metricBuffer[len(metricBuffer)-2] == metric.METRIC_TAIL_INLINE {
 					readingMetric = false
-					logger.Println("readingMetric is off :", string(buff))
 
 					metricBuffer = metricBuffer[:len(metricBuffer)-2]
 					if metricBuffer[0] == '{' {
@@ -289,6 +289,8 @@ func (hc *houstonClient) launch(meta *procmeta) error {
 
 						if accessor, ok := metricValues[string(keybytes)]; ok {
 							accessor.set(val)
+						} else {
+							logger.Println("metric set but unregistered :", string(keybytes))
 						}
 					}