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From Oleg Kalnichevski <ol...@apache.org>
Subject Re: Regarding closing of idle connections for non-reusable / non-threaded httpClient instances to ensure complete connection closure
Date Fri, 16 May 2008 09:46:00 GMT
On Thu, 2008-05-15 at 20:27 -0700, Sujith Joseph wrote:
> Hi Oleg,
>            Thanks for your reply. I really appreciate your help. I have
> couple of more questions on this.
> 
>  I am currently using httpclient 3.0 library.
> SimpleConnectionManager.shutdown () method is not available in 3.0 libs. if
> I am continuing to use these libraries in my application, can I use
> httpClient.getConnectionManager(). closeIdleConnections(1) to close of
> connections?.
> 

Yes, you can. #´╗┐closeIdleConnections(0) should be even better


> Would setting small values like 1 millisecond for idle connection timeout be
> an overhead to the JVM and impact performance?

I do not think so.

> Would this act as a replacement for SimpleConnectionManager.shutdown()?
> 

Partially. At the very least it would leave no idle connection open,
which should result in closure of all open sockets.


> Based on your reply, I assume that you recommend re-using the same
> httpClient instance for all http requests, instead of creating httpClient
> instances for each http requests, even if we are not using
> MultiThreadedConnectionManager. Is it because, that the latter approach has
> an overhead of creating/closing more connections and no re-use of
> connections and thereby giving less throughput?.
> 

Yes, it is. Just make sure to not execute requests from multiple threads
without synchronization.

> 
> Are you aware of any issues in using HttpClient 3.1 libraries in Websphere
> Application Server (WAS) 5.1. ? I have not tried this yet. But if you
> already know this, I think, I could save some testing time .
> 

No, I am not. However, I have been lucky enough to have not touched WAS
for 4 years.

Oleg

> 
> Thanks,
> Sujith
> 
> 
> On Thu, May 15, 2008 at 12:10 PM, Oleg Kalnichevski <olegk@apache.org>
> wrote:
> 
> > On Tue, 2008-05-13 at 17:36 -0700, Sujith Joseph wrote:
> > > Hi,
> > >      I would like to know whether it is necessary to invoke
> > > httpClient.getConnectionManager(). closeIdleConnections(1000), after
> > > creating
> > > an httpClient (httpClient = new HttpClient()), creating an httpmethod,
> > > executing the httpmethod  and performing method.releaseConnection(), to
> > > ensure that the http connections are properly closed, since I am creating
> > an
> > > httpClient instance for each and every http request (since I am not using
> > > MultiThreadedConnectionManager).
> >
> > That basically means you are telling HttpClient to close connections
> > that have been idle for 1000 ms. I am not sure that is what you want.
> >
> > >
> > > If I am creating a httpClient instance (without using
> > > MutliThreadedConnectionManager), Does a SimpleHttpConnectionManager gets
> > > created for each httpClient creation behind the scenes.
> > >
> >
> > Yes, it does.
> >
> > > Can I perform a type cast like this
> > > ((SimpleHttpConnectionManager)httpClient.getConnectionManager).shutdown()
> > to
> > > ensure complete release of connections.
> > >
> >
> > Yes, you can. Moreover, you really should.
> >
> > >  If I am not using the httpClient instance anymore after executing a http
> > > method request, do you recommend closing off idle connections / shut down
> > > ConnectionManager, to avoid creation of too many open sockets in
> > CLOSE_WAIT
> > > state.
> > >
> >
> > You _should_ shut down the connection manager if you no longer need it
> > and want to ensure it releases all resources it currently holds
> >
> > > Can I re-use the same httpClient instance to perform http method
> > executions,
> > > if I am not using a multi-threaded Connection Manager?
> > >
> >
> > Absolutely.
> >
> > Oleg
> >
> > >
> > > Thanks,
> > > Sujith
> >
> >
> > ---------------------------------------------------------------------
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> > For additional commands, e-mail: httpclient-users-help@hc.apache.org
> >
> >


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