public void delete(String bucket, String key) throws IOException {
delete(ByteString.copyFromUtf8(bucket), ByteString.copyFromUtf8(key));
}
public void delete(ByteString bucket, ByteString key) throws IOException {
RpbDelReq req = RPB.RpbDelReq.newBuilder().setBucket(bucket)
.setKey(key).build();
RiakConnection c = getConnection();
try {
c.send(MSG_DelReq, req);