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From sebb <seb...@gmail.com>
Subject Re: Handling idle timeout disconnect
Date Sat, 22 Feb 2014 14:16:36 GMT
On 22 February 2014 14:10, Oleg Kalnichevski <olegk@apache.org> wrote:
> On Fri, 2014-02-21 at 23:07 +0000, sebb wrote:
>> Further to the recent email about unexpected behaviour in JMeter when
>> staleCheck was disabled, the cause has been determined.
>>
>> The problem was caused by a server operating an idle timeout policy,
>> but failing to send a Keep-Alive header with the timeout information.
>>
>
> 'Keep-Alive' is a non-standard header. Web servers do not have to
> support it.

OK, did not know that.

>> Thus the HC code did not know that the connection would timeout, and
>> tried to re-use it.
>> This resulted in an immediate disconnect.
>> Since JMeter does not retry by default, this caused the sample to fail.
>>
>> I'm wondering whether this scenario should be handled automatically by HC.
>> It could in theory happen even with servers that send the Keep-Alive
>> header if the server and client ideas of elapsed time are not very
>> consistent.
>>
>> The idea would be to retry the request IFF the connect immediately
>> fails - i.e. before any data has been sent.
>>
>> This could not cause a problem with non-idempotent requests, as the
>> request would not actually have been sent.
>>
>> Does that sound reasonable, or is it something the app developer needs
>> to implement in a retry handler?
>>
>
> I believe we already all these features in HttpClient. All you need is
> to activate the default retry handler with retry count 1. Give it a
> shot.

Thanks, I will try it.

IIRC, we disabled retries because they were causing unexpected extra
traffic to be sent to servers.
Also, generally testers need to know when requests fail, as it affects
throughput.

So we may need our own retry handler for this specific case.

> Cheers
>
> Oleg
>
>
>
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