reuse slice with max cap

Signed-off-by: Alan Protasio <[email protected]>

Author: alanprot

pkg/util/grpcencoding/snappyblock/snappyblock.go

@@ -27,15 +27,15 @@ func newCompressor() *compressor {
 		New: func() interface{} {
 			return &reader{
 				pool:  &c.readersPool,
-				cbuff: bytes.NewBuffer(make([]byte, 0, 512)),
+				cbuff: bytes.NewBuffer(make([]byte, 512, 512)),
 			}
 		},
 	}
 	c.writersPool = sync.Pool{
 		New: func() interface{} {
 			return &writeCloser{
 				pool: &c.writersPool,
-				buff: bytes.NewBuffer(make([]byte, 0, 512)),
+				buff: bytes.NewBuffer(make([]byte, 512, 512)),
 			}
 		},
 	}
@@ -95,7 +95,7 @@ func (w *writeCloser) Write(p []byte) (n int, err error) {
 func (w *writeCloser) Close() error {
 	defer func() {
 		w.buff.Reset()
-		w.dst = w.dst[:0]
+		w.dst = w.dst[0:cap(w.dst)]
 		w.pool.Put(w)
 	}()