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From SQ <se...@compusystems.com>
Subject Re: Response Swapping
Date Mon, 21 Mar 2011 22:06:52 GMT

Hey Mark,

Thanks for the response.  I have answered your questions below.


Mark Thomas wrote:
> 
> On 18/03/2011 21:05, SQ wrote:
>> 
>> Environment:
>> Solaris 10
>> Apache 2.2.16
>> mod_jk 1.2.31
>> Tomcat 5.5.30
>> JVM 1.6.0_14
> 
>>Which AJP connector are you using? Is APR/native being used?
> 
> AJP13.  No, I don't see APR being loaded at startup.  Only mention of APR
> in the config is a default setting in server.xml:
> 
> <Server port="8005" shutdown="SHUTDOWN">
> 
>   <!-- Comment these entries out to disable JMX MBeans support used for
> the
>        administration web application -->
>   <Listener className="org.apache.catalina.core.AprLifecycleListener" />
> 
>>An upgrade to the latest 5.5.33 wouldn't hurt but I don't see anything
>>in the changelog.
> 
> Yes, we'll probably give that a go soon, but like you said there isn't
> much in the changelog that addresses an issue like this.
> 
>>There is this https://issues.apache.org/bugzilla/show_bug.cgi?id=47714
>>which is tracking various reports of various quality of a similar issue.
>>There are some suggestions about possible work-arounds there too.
> 
> Yes, I did see this bug listing, but there didn't seem to be a definite
> result.  A couple people mentioned DisableReuse, which we can try, but
> according to the docs, there is a performance hit.  Also, without being
> able to replicate the issue, its hard to determine if that would help.
> 
>> One of the JSP that got wrong responses in testing contained nothing but
>> html - it doesn't look like code in the JSPs themselves are causing this.
> 
>>That is a useful indicator. Assuming no filters etc. are in the mix then
>>that tends to rule out the app.
> 
>> In earlier, less-intensive testing, we found that requests directly to
>> Tomcat weren't experiencing response swapping, but requests through
>> Apache
>> to Tomcat were - this has not yet been confirmed with the testing tool.  
> 
>>This tends to point towards something in Tomcat's AJP connector although
>>based on past experience nothing is certain until we understand exactly
>>what the problem is.
> 
>>Mark
> 
> 
> 
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> 

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