diff --git a/log/global.go b/log/global.go
index ab993ba08..c3dc292c2 100644
--- a/log/global.go
+++ b/log/global.go
@@ -1,15 +1,11 @@
 package log
 
 import (
-	"fmt"
-	"os"
 	"sync"
 )
 
 // globalLogger is designed as a global logger in current process.
-var (
-	global = &loggerAppliance{}
-)
+var global = &loggerAppliance{}
 
 type loggerAppliance struct {
 	lock   sync.Mutex
@@ -38,89 +34,87 @@ func SetLogger(logger Logger) {
 	global.SetLogger(logger)
 }
 
+// GetLogger returns global logger in current process.
 func GetLogger() Logger {
 	return global.GetLogger()
 }
 
 // Log Print log by level and keyvals.
 func Log(level Level, keyvals ...interface{}) {
-	_ = global.logger.Log(level, keyvals...)
+	global.helper.Log(level, keyvals...)
 }
 
 // Debug logs a message at debug level.
 func Debug(a ...interface{}) {
-	global.helper.Log(LevelDebug, global.helper.msgKey, fmt.Sprint(a...))
+	global.helper.Debug(a...)
 }
 
 // Debugf logs a message at debug level.
 func Debugf(format string, a ...interface{}) {
-	global.helper.Log(LevelDebug, global.helper.msgKey, fmt.Sprintf(format, a...))
+	global.helper.Debugf(format, a...)
 }
 
 // Debugw logs a message at debug level.
 func Debugw(keyvals ...interface{}) {
-	global.helper.Log(LevelDebug, keyvals...)
+	global.helper.Debugw(keyvals...)
 }
 
 // Info logs a message at info level.
 func Info(a ...interface{}) {
-	global.helper.Log(LevelInfo, global.helper.msgKey, fmt.Sprint(a...))
+	global.helper.Info(a...)
 }
 
 // Infof logs a message at info level.
 func Infof(format string, a ...interface{}) {
-	global.helper.Log(LevelInfo, global.helper.msgKey, fmt.Sprintf(format, a...))
+	global.helper.Infof(format, a...)
 }
 
 // Infow logs a message at info level.
 func Infow(keyvals ...interface{}) {
-	global.helper.Log(LevelInfo, keyvals...)
+	global.helper.Infow(keyvals...)
 }
 
 // Warn logs a message at warn level.
 func Warn(a ...interface{}) {
-	global.helper.Log(LevelWarn, global.helper.msgKey, fmt.Sprint(a...))
+	global.helper.Warn(a...)
 }
 
 // Warnf logs a message at warnf level.
 func Warnf(format string, a ...interface{}) {
-	global.helper.Log(LevelWarn, global.helper.msgKey, fmt.Sprintf(format, a...))
+	global.helper.Warnf(format, a...)
 }
 
 // Warnw logs a message at warnf level.
 func Warnw(keyvals ...interface{}) {
-	global.helper.Log(LevelWarn, keyvals...)
+	global.helper.Warnw(keyvals...)
 }
 
 // Error logs a message at error level.
 func Error(a ...interface{}) {
-	global.helper.Log(LevelError, global.helper.msgKey, fmt.Sprint(a...))
+	global.helper.Error(a...)
 }
 
 // Errorf logs a message at error level.
 func Errorf(format string, a ...interface{}) {
-	global.helper.Log(LevelError, global.helper.msgKey, fmt.Sprintf(format, a...))
+	global.helper.Errorf(format, a...)
 }
 
 // Errorw logs a message at error level.
 func Errorw(keyvals ...interface{}) {
-	global.helper.Log(LevelError, keyvals...)
+	global.helper.Errorw(keyvals...)
 }
 
 // Fatal logs a message at fatal level.
 func Fatal(a ...interface{}) {
-	global.helper.Log(LevelFatal, global.helper.msgKey, fmt.Sprint(a...))
-	os.Exit(1)
+	global.helper.Fatal(a...)
 }
 
 // Fatalf logs a message at fatal level.
 func Fatalf(format string, a ...interface{}) {
-	global.helper.Log(LevelFatal, global.helper.msgKey, fmt.Sprintf(format, a...))
-	os.Exit(1)
+	global.helper.Fatalf(format, a...)
 }
 
 // Fatalw logs a message at fatal level.
 func Fatalw(keyvals ...interface{}) {
-	global.helper.Log(LevelFatal, keyvals...)
-	os.Exit(1)
+	global.helper.Fatalw(keyvals...)
 }
diff --git a/transport/grpc/client.go b/transport/grpc/client.go
index 13a28eff0..958347475 100644
--- a/transport/grpc/client.go
+++ b/transport/grpc/client.go
@@ -124,7 +124,7 @@ func dial(ctx context.Context, insecure bool, opts ...ClientOption) (*grpc.Clien
 	options := clientOptions{
 		timeout:      2000 * time.Millisecond,
 		balancerName: wrr.Name,
-		logger:       log.DefaultLogger,
+		logger:       log.GetLogger(),
 	}
 	for _, o := range opts {
 		o(&options)