jakartacommons-httpclient-3.x: 3 seconds additional latency in response times

[Amit M Bhosle <bh...@gmail.com>]

Hi:

occasionally, the response sent by my server arrives at my client after a
delay of 3 seconds! the delay occurs only occasionally (e.g., 1 in few 100
or so requests is impacted).

I've verified that there's no delay in setting up the connection, and the
request from the client reaching the server, but the response gets delayed
for whatever reason. someone pointed me to the TCP 3-way handshake which
includes the SYN retry (which has a default retry after 3 seconds), and the
TCP handshake is executed both at connection setup and tear-down stages. but
I'm not sure if the connection tear-down is blocking for the communication.

I'm considering moving to persistent connections for other reasons too, but
that would not help if the tear-down is non-blocking.

my client uses JakartaCommons-httpclient-3.0.1 , and was wondering if
there's any known issue with this version.

any insights/pointers would be appreciated.

thanks
AB

Re: jakartacommons-httpclient-3.x: 3 seconds additional latency in response times

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

Amit M Bhosle wrote:
> Hi:
> 
> occasionally, the response sent by my server arrives at my client after a
> delay of 3 seconds! the delay occurs only occasionally (e.g., 1 in few 100
> or so requests is impacted).
> 
> I've verified that there's no delay in setting up the connection, and the
> request from the client reaching the server, but the response gets delayed
> for whatever reason. someone pointed me to the TCP 3-way handshake which
> includes the SYN retry (which has a default retry after 3 seconds), and the
> TCP handshake is executed both at connection setup and tear-down stages. but
> I'm not sure if the connection tear-down is blocking for the communication.
> 
> I'm considering moving to persistent connections for other reasons too, but
> that would not help if the tear-down is non-blocking.
> 
> my client uses JakartaCommons-httpclient-3.0.1 , and was wondering if
> there's any known issue with this version.
> 
> any insights/pointers would be appreciated.
> 
> thanks
> AB
> 

I am nor aware of reports of this kind of problem by other users. 
Regardless, you should consider upgrading to version 4.0

Oleg

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