private String buildMsg(int messageSize) {
        StringBuilder sb = new StringBuilder();
        // 1KB
        for (int i = 0; i < messageSize * 1024; i++) {
            sb.append('a');
        }
        return sb.toString();
    }
@author <a href=mailto:leizhiyuan@gmail.com>leizhiyuan</a>
test/test-integration/src/test/java/com/alipay/sofa/rpc/test/triple/TripleServerTest.java