At last i modified the code as below and still i see ~50K requests/sec ..

public class HelloWorldServer {

public static void main(final String[] args) {
Undertow server = Undertow.builder().addHttpListener(8009, "localhost").setHandler(new HttpHandler() {
@Override
public void handleRequest(final HttpServerExchange exchange) throws Exception {

if (exchange.isInIoThread()) {
exchange.dispatch(this);
return;
}
if (exchange.getRequestMethod().equals(Methods.POST)) {
BufferedReader reader = null;
StringBuilder builder = new StringBuilder();
try {
exchange.startBlocking();
reader = new BufferedReader(new InputStreamReader(exchange.getInputStream()));
String line;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
String body = builder.toString();
System.out.println("Req Body ==> " + body);
exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain");
exchange.getResponseSender().send("SUCCESS");
} else {
exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain");
exchange.getResponseSender().send("FAILURE");
}
}
}).build();
server.start();
}
}

On Thu, Jun 22, 2017 at 11:57 PM, SenthilKumar K <senthilec566@gmail.com> wrote:
Seems to Reading Request body is wrong , So what is the efficient way of reading request body in undertow ?

--Senthil

On Thu, Jun 22, 2017 at 11:30 PM, SenthilKumar K <senthilec566@gmail.com> wrote:
Hello Undertow Dev Team ,

      I have been working on the use case where i should create simple http server to serve 1.5 Million Requests per Second per Instance .. 


Here is the benchmark result of Undertow :

Running 1m test @ http://127.0.0.1:8009/
  20 threads and 40 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     2.51ms   10.75ms 282.22ms   99.28%
    Req/Sec     1.12k   316.65     1.96k    54.50%
  Latency Distribution
     50%    1.43ms
     75%    2.38ms
     90%    2.90ms
     99%   10.45ms
  1328133 requests in 1.00m, 167.19MB read
Requests/sec:  22127.92
Transfer/sec:      2.79MB

This is less compared to other frameworks like Jetty and Netty .. But originally Undertow is high performant http server .. 

Hardware details:
Xeon CPU E3-1270 v5 machine with 4 cores ( Clock 100 MHz, Capacity 4 GHz) , Memory : 32 G , Available memory 31 G.

I would need Undertow experts to review the server code below and advice me on tuning to achieve my goal( ~1.5 Million requests/sec ).

Server :

Undertow server = Undertow.builder()
               .addHttpListener(8009, "localhost")
               .setHandler(new Handler()).build();
server.start();


Handler.Java

    final Pooled<ByteBuffer> pooledByteBuffer =          
                 exchange.getConnection().getBufferPool().allocate();
final ByteBuffer byteBuffer = pooledByteBuffer.getResource();
   byteBuffer.clear();
   exchange.getRequestChannel().read(byteBuffer);
   int pos = byteBuffer.position();
   byteBuffer.rewind();
   byte[] bytes = new byte[pos];
   byteBuffer.get(bytes);
   String requestBody = new String(bytes, Charset.forName("UTF-8") );
   byteBuffer.clear();
   pooledByteBuffer.free();
   final PostToKafka post2Kafka = new PostToKafka();
try {
post2Kafka.write2Kafka(requestBody);  { This API can handle  ~2 Millions events per sec }
} catch (Exception e) {
e.printStackTrace();
}
    exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain");
    exchange.getResponseSender().send("SUCCESS");


--Senthil