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From Oleg Kalnichevski <ol...@apache.org>
Subject Re: Many sockets open in CLOSE_WAIT state
Date Tue, 28 Nov 2006 16:22:34 GMT
On Mon, 2006-11-27 at 12:26 +0000, David Cotter wrote:
> Hi there,
> 
> I am having a problem with too many open files on my server. I am using
> HttpClient v.3.0 and the server application is a proxy web app that
> retrieves the content using HttpClient and passes it back to the user using
> a Tomcat servlet.  I am serving 1000s of  different users with several sever
> requests per second. As time goes on the JVM memory usage steadily increases
> as the number of open files/sockets in CLOSE_WAIT state on the Linux machine
> increases. I can see from inspection that many of the open files are socket
> connection to third party sites opened with HttpClient.
> 
> For every method executed I use a shared MultiThreadedHttpConnectionManager
> and always call method.releaseConnection().
> 
> I have instantiated  IdleConnectionTimeoutThread and also have another
> thread that occasionally calls:
> multiThreadedHttpConnectionManager.closeIdleConnections(idleTimeoutMillis);
> multiThreadedHttpConnectionManager.deleteClosedConnections();
> 
> I have overridden MultiThreadedHttpConnectionManager.releaseConnection ()
> and included a connection.close() in this function but have not seen any
> results - always steadily increasing open files.
> 
> I have seen reference to overriding
> MultiThreadedHttpConnectionManager.releaseConnection () to force sockets to
> close on this list but nothing concrete as to what to put in the overrided
> function.
> 
> I would appreciate any help on this.
> 

David,

The only rational explanation I can think of is that sockets remain in
the CLOSE_WAIT state due to some OS level settings. Calling #close() on
all connections released back to the connection manager should
definitely leave no sockets in the CLOSE_WAIT state.

Oleg


> Regards,
> David


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