AuthPacket authPacket = new AuthPacket();
ZooKeeperServer.byteBuffer2Record(incomingBuffer, authPacket);
String scheme = authPacket.getScheme();
AuthenticationProvider ap = ProviderRegistry.getProvider(scheme);
if (ap == null
|| (ap.handleAuthentication(this, authPacket.getAuth())
!= KeeperException.Code.OK)) {
if (ap == null) {
LOG.warn("No authentication provider for scheme: "
+ scheme + " has "
+ ProviderRegistry.listProviders());