HTTP Keep Alive

An aditional note:

 

This behavior may explain why the benchmark test by WSO2 (http://wso2.org/library/3740) observed a consistent request drop of 1%. It seems that the HTTP connection closes consistently 1 time after 100 requests. Since I’m using the same load application, this means 1 write error for each 100 requests.

 

Marcio.

 

 

Hi all,

 

I’m trying to run a load test using HTTP as the protocol. The client application sends a “keep alive” HTTP header on each request and keeps the connection opened. I noticed that the server closes the connection even though keep alive was set. When this occurs, the client gets a socket exception when it tries to write something, since the connection was closed by the server.

 

This is the output from the client before sending each request:

 

>> POST /services/DirectProxy HTTP/1.1

>> SOAPAction:  urn:buyStocks.2

>> Content-Length: 512

>> Content-Type: text/xml; charset=UTF-8

>> Host: localhost:8090

>> Connection: Keep-Alive

>> User-Agent: Jakarta-HttpComponents-Bench/1.1

 

 

If I set the load application for just two iterations, the second iteration already gets an exception. What should I do to prevent the server (Mule) from closing the connections? I’ve noticed that if I set keepAlive=”true” on the HTTP connector, the server doesn’t close the connection so often, but it still closes it from time to time, although this keepAlive setting comes from the TCP connector (SO_KEEPALIVE) and has nothing to do with the HTTP keep alive.

 

((((((Response from Iteration 1:

 

200

<< HTTP/1.1 200 OK

<< Content-Type: text/xml;charset=UTF-8

<< Expires: Mon, 30 Jun 2008 07:21:39 BRT

<< Date: Mon, 30 Jun 2008 22:21:39 GMT

<< Server: Apache-Coyote/1.1

<< MULE_CORRELATION_ID: e8bb6cbd-46f2-11dd-9e61-97cc4ddd01de

<< MULE_CORRELATION_GROUP_SIZE: -1

<< MULE_CORRELATION_SEQUENCE: -1

<< Transfer-Encoding: chunked

 

((((((((From the server log:

 

INFO  2008-06-30 19:21:39,201 [HttpConnector.receiver.3] org.mule.transport.http

.HttpMessageReceiver: Closing HTTP connection.

 

(((((((When it tries to write on Iteration 2:

 

java.net.SocketException: Software caused connection abort: socket write error

        at java.net.SocketOutputStream.socketWrite0(Native Method)

        at java.net.SocketOutputStream.socketWrite(Unknown Source)

        at java.net.SocketOutputStream.write(Unknown Source)

        at org.apache.http.impl.io.AbstractSessionOutputBuffer.write(AbstractSes

sionOutputBuffer.java:109)

        at org.apache.http.impl.io.ContentLengthOutputStream.write(ContentLength

OutputStream.java:113)

        at org.apache.http.entity.FileEntity.writeTo(FileEntity.java:83)

        at org.apache.http.impl.entity.EntitySerializer.serialize(EntitySerializ

er.java:97)

        at org.apache.http.impl.AbstractHttpClientConnection.sendRequestEntity(A

bstractHttpClientConnection.java:161)

        at org.apache.http.protocol.HttpRequestExecutor.doSendRequest(HttpReques

tExecutor.java:237)

        at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecu

tor.java:119)

        at org.apache.http.contrib.benchmark.BenchmarkWorker.run(BenchmarkWorker

.java:160)

        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source

)

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

        at java.lang.Thread.run(Unknown Source)

I/O error: Software caused connection abort: socket write error