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From "Andreas Veithen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AXIS2-2931) CLONE -Web Service request loop causes many TIME_WAIT Connections & "BindException: Address already in use: connect"
Date Fri, 27 Feb 2009 10:28:12 GMT

    [ https://issues.apache.org/jira/browse/AXIS2-2931?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12677308#action_12677308
] 

Andreas Veithen commented on AXIS2-2931:
----------------------------------------

Reading the entire response into memory is a performance issue for two reasons:
* Axis2 would no longer be able to start processing the response before the entire message
has been received.
* The raw content of the entire message would have to be kept in memory. The argument that
"an xml parser will have to do it at some point anyway" is not valid. Even if the full Axiom
tree of the message is built (which is not necessarily the case), there is no justification
for having two copies of the message in memory (one in the form of a byte array, the other
in the form of an Axiom tree).

> CLONE -Web Service request loop causes many TIME_WAIT Connections & "BindException:
Address already in use: connect"
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: AXIS2-2931
>                 URL: https://issues.apache.org/jira/browse/AXIS2-2931
>             Project: Axis 2.0 (Axis2)
>          Issue Type: Bug
>    Affects Versions: 1.1.1, nightly
>         Environment: Windows XP, Tomcat, Axis2 nightly build (also encountered in 1.1.1),
JiBX 1.1.3, Microsoft Windows XP [Version 5.1.2600], 126 GB free disk space, 1GB RAM.
>            Reporter: Gerry Holly
>            Priority: Critical
>         Attachments: 0001-AXIS2-2931-AXIS2-3478-Release-the-HTTP-connection.patch
>
>
> I am performing the following:
> - Executing a tight loop calling a singel web service
> - Using the same Stub over and over
> - Creating the Stub with a custom ConfigurationContext (see below)
> - Sending cleanup() to Stub after each message sent (although problem existed even before
cleanup() was added)
> After approximately 4000 messages have been sent, an AxisFault is generated caused by
the following exception (see below for full stack trace):
> 	java.net.BindException: Address already in use: connect
> It appears that connections from the client to Axis on Tomcat sometimes (but not always)
remain in the TIME_WAIT state for several minutes.  There are 1200-1500 TIME_WAIT connections
open when the AxisFault is generated.
> If I step through the web service messages in a debugger, the problem does not appear
to occur, as the system eventually releases the connections after a minute or two.
> Also, if I insert a System.gc() in the client code each time it sends a message to the
web service (the commented out line of code below), the AxisFault does not occur.  I have
executed the loop over 60,000 times with the garbage collection included without generating
an AxisFault.  There were only 400-700 connections in the TIME_WAIT state at a given time,
but performance slowed down to a crawl.
> Here is the code I am using to create the Stub:
> 	HttpConnectionManagerParams connectionManagerParams = new HttpConnectionManagerParams();
> 	connectionManagerParams.setTcpNoDelay(true);
> 	connectionManagerParams.setStaleCheckingEnabled(true);
> 			
> 	MultiThreadedHttpConnectionManager connectionManager = new MultiThreadedHttpConnectionManager();
> 	connectionManager.setParams(connectionManagerParams);
> 	HttpClient httpClient = new HttpClient(connectionManager);
> 			
> 	ConfigurationContext configurationContext = ConfigurationContextFactory.createConfigurationContextFromFileSystem(null,
null);
> 	configurationContext.setProperty(HTTPConstants.REUSE_HTTP_CLIENT, Boolean.TRUE);
> 	configurationContext.setProperty(HTTPConstants.CACHED_HTTP_CLIENT, httpClient);
> 			
> 	stub = new MyServiceStub(configurationContext, target);
> 	
> 	boolean success = true;
> 	while(success) {
> 		success = stub.performService(records);
> 		stub.cleanup();
> 		//  System.gc();
> 	}
> Here is the complete stack trace:
> 	Exception in thread "main" org.apache.axis2.AxisFault: Address already in use: connect
> 		at org.apache.axis2.AxisFault.makeFault(AxisFault.java:377)
> 		at org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:179)
> 		at org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:73)
> 		at org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:310)
> 		at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:202)
> 		at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:446)
> 		at org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:330)
> 		at org.apache.axis2.description.OutInAxisOperationClient.execute(OutInAxisOperation.java:294)
> 		at com.ws.service.MyServiceStub.performService(MyServiceStub.java:300)
> 		at com.ws.client.MyClient.main(MyClient.java:88)
> 	Caused by: java.net.BindException: Address already in use: connect
> 		at java.net.PlainSocketImpl.socketConnect(Native Method)
> 		at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
> 		at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
> 		at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
> 		at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
> 		at java.net.Socket.connect(Socket.java:519)
> 		at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
> 		at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 		at java.lang.reflect.Method.invoke(Method.java:585)
> 		at org.apache.commons.httpclient.protocol.ReflectionSocketFactory.createSocket(ReflectionSocketFactory.java:139)
> 		at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:124)
> 		at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:706)
> 		at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:386)
> 		at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:170)
> 		at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:396)
> 		at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:346)
> 		at org.apache.axis2.transport.http.AbstractHTTPSender.executeMethod(AbstractHTTPSender.java:558)
> 		at org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:176)
> 		... 8 more

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