Use buffered writer for Snappy compression.

The non-buffered writer is now deprecated. Also the amount of compression achieved and the CPU overhead is much better when using the buffered writer.

conn.go

@@ -119,8 +119,7 @@ func NewConn(addr string, config *Config, delegate ConnDelegate) *Conn {
 // The logger parameter is an interface that requires the following
 // method to be implemented (such as the the stdlib log.Logger):
 //
-// Output(calldepth int, s string)
-//
+// Output(calldepth int, s string)
 func (c *Conn) SetLogger(l logger, lvl LogLevel, format string) {
  c.logGuard.Lock()
  defer c.logGuard.Unlock()
@@ -468,7 +467,7 @@ func (c *Conn) upgradeSnappy() error {
  conn = c.tlsConn
  }
  c.r = snappy.NewReader(conn)
- c.w = snappy.NewWriter(conn)
+ c.w = snappy.NewBufferedWriter(conn)
  frameType, data, err := ReadUnpackedResponse(c, c.config.MaxMsgSize)
  if err != nil {
  return err