HttpClient blocks forever sometimes when open a HTTPS connection

[diegopatr <di...@gmail.com>]

Hi all,

I'm using HTTPClient together with Axis 2. My threads executes thousands of
calls to webservices per day. Sometimes those threads blocks forever, none
of the timeouts are executed and I need to restart the application. I have
researched everything in the net but I can't found a solution.

I put the logs in TRACE mode. The last log message when a thread became
blocked is always the same:

DEBUG org.apache.commons.httpclient.HttpConnection - Open connection to
xxx.xxx.xxx.xxx:443

The next message should be:

TRACE org.apache.commons.httpclient.HttpMethodBase - enter
HttpMethodBase.execute(HttpState, HttpConnection)

Which blocking operations are doing between this two points?

I have one MultiThreadedHttpConnectionManager and one HTTPClient shared
between all the threads.

I setup it using this code:

        HttpConnectionManagerParams cmparams = new
HttpConnectionManagerParams();
        cmparams.setSoTimeout(timeout);
        cmparams.setDefaultMaxConnectionsPerHost(100);
        cmparams.setMaxTotalConnections(500);
        cmparams.setConnectionTimeout(timeout);
        cmparams.setTcpNoDelay(true);

        HttpClientParams params = new HttpClientParams();
        params.setSoTimeout(timeout);
        params.setConnectionManagerTimeout(timeout);

        conmgr = new MultiThreadedHttpConnectionManager();
        conmgr.setParams(cmparams);

        httpClient = new HttpClient(params, conmgr);

What you suggested to resolve this problem? 

Thanks,
Diego Patricio


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Re: HttpClient blocks forever sometimes when open a HTTPS connection

[Oleg Kalnichevski <ol...@apache.org>]

diegopatr wrote:
> Hi all,
> 
> I'm using HTTPClient together with Axis 2. My threads executes thousands of
> calls to webservices per day. Sometimes those threads blocks forever, none
> of the timeouts are executed and I need to restart the application. I have
> researched everything in the net but I can't found a solution.
> 
> I put the logs in TRACE mode. The last log message when a thread became
> blocked is always the same:
> 
> DEBUG org.apache.commons.httpclient.HttpConnection - Open connection to
> xxx.xxx.xxx.xxx:443
> 
> The next message should be:
> 
> TRACE org.apache.commons.httpclient.HttpMethodBase - enter
> HttpMethodBase.execute(HttpState, HttpConnection)
> 
> Which blocking operations are doing between this two points?
> 

Socket connect and SSL handshaking, which A LOT


> I have one MultiThreadedHttpConnectionManager and one HTTPClient shared
> between all the threads.
> 
> I setup it using this code:
> 
>         HttpConnectionManagerParams cmparams = new
> HttpConnectionManagerParams();
>         cmparams.setSoTimeout(timeout);
>         cmparams.setDefaultMaxConnectionsPerHost(100);
>         cmparams.setMaxTotalConnections(500);
>         cmparams.setConnectionTimeout(timeout);
>         cmparams.setTcpNoDelay(true);
> 
>         HttpClientParams params = new HttpClientParams();
>         params.setSoTimeout(timeout);
>         params.setConnectionManagerTimeout(timeout);
> 
>         conmgr = new MultiThreadedHttpConnectionManager();
>         conmgr.setParams(cmparams);
> 
>         httpClient = new HttpClient(params, conmgr);
> 
> What you suggested to resolve this problem? 
> 

Implement a custom socket factory which would give you a complete 
control over the process of connection setup.

Also consider upgrading to HttpClient 4.0

Oleg

> Thanks,
> Diego Patricio
> 
> 


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