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From "Durk Strooisma" <d...@kern.nl>
Subject Re: FW: question regarding 'mod_jk: error flushing'
Date Thu, 02 Nov 2006 10:54:17 GMT
Alright, thanks for your explanation!

Are the "mod_jk: error flushing" messages more or less harmless? If so, I
prefer sticking to 1.2.6 for the moment.

Durk

> Hi Durk,
>
> the flushing has been changed in May 2005 around the time of version
> 1.2.13 or 1.2.14. Previously there were a lot of calls to ap_rflush()
> during the writing of responses. Because that produced many problems
> (not only log messages) concerning performance and memory requirements,
> these calls have been made optional.
>
> So updating to 1.2.19 really changes the flushing behaviour (and the
> log statement is not there any longer). The old behaviour (lots of
> flushing, but without the annoying log messages) can be configured with
> newer mod_jk with "JkOptions +FlushPackets". That should only be
> necessary, if your application has complex timing requirements. Per
> default the switch is off.
>
> Regards,
>
> Rainer
>
> Durk Strooisma schrieb:
>>> Hi Durk,
>>>
>>> are you really talking about mod_jk?
>>
>> Yep, the package "apache2-jakarta-tomcat-connectors" contains (from
>> the included README file):
>> 1. mod_jk + Ajp13Connector
>> 2. mod_jk2 + CoyoteConnector + JkCoyoteHandler
>> 3. mod_webapp + WarpConnector
>>
>> 2 is experimental, 3 is deprected, we're using option 1; mod_jk.
>>
>>> If yes: which version of nod_jk
>>> are  you using? It would be nice, if you could check version 1.2.19.
>>
>> It was kinda hard to figure out the version... I've grepped in
>> /usr/lib/apache2/mod_jk.so for '1.2', and it came up with "1.2.6-dev".
>>
>> Source for the "apache2-jakarta-tomcat-connectors" package was a
>> tarball called "jakarta-tomcat-connectors-4.1.30-src.tar.gz". 4.1.30
>> seems to be the version of connector bundle. I found the jk-version in
>> jakarta-tomcat-connectors-4.1.30-src/jk/native/common/jk_version.h,
>> which shows: 1.2.6, just as expected.
>>
>> Replacing this version with 1.2.9 isn't quite easy considering
>> maintenance. The version that came with the SUSE-distribution ensures
>> stability/compatibility (at least I may hope so considering it's an
>> enterprise grade distro) and is easier maintainable (security updates
>> just come with the update tool).
>>
>> Well, I COULD do some tests with other versions of mod_jk on the
>> testing system, but as long as the issue doesn't harm the
>> functionality of the web applications, I'm hesitating a little in
>> investing my time and downtime of the system.
>>
>> But then again, IF a new version of mod_jk would eliminate the error
>> messages, we still don't know why or what it actually was.
>>
>> Durk
>>
>>> Regards,
>>>
>>> Rainer
>>>
>>> Durk Strooisma wrote:
>>>> Hi all!
>>>>
>>>> I'm wondering the same.
>>>>
>>>> I've got four servers (two production machines and their testing
>>>> counter parts) running SUSE Linux Enterprise Server 9 with Apache 2,
>>>> Tomcat 5, and ModJK. Below the relevant packages are shown:
>>>>
>>>> apache2                           2.0.49-27.59
>>>> apache2-prefork                   2.0.49-27.59
>>>> apache2-jakarta-tomcat-connectors 5.0.19-29.1
>>>> jakarta-tomcat                    5.0.19-29.1
>>>>
>>>> Since June 2006 I'm getting lots of "mod_jk: Error flushing \n" on
>>>> one production system (and its testing system as well), but
>>>> everything seems to work fine... The other production system isn't
>>>> affected.
>>>>
>>>> It's kind of annoying that there's no timestamp shown in the error
>>>> message. Debugging is really tough this way. I'm wondering what it
>>>> means and whether it's harmless or not. Like Kevin states, nowhere
>>>> on the internet this question seems to answered.
>>>>
>>>> Thanks in advance!
>>>>
>>>> Durk
>>>>
>>>>
>>>>> Hello there,
>>>>>
>>>>> Does anyone know what is this 'mod_jk: error flushing' about? I am
>>>>> using Tomcat 5.0, Apache and Mod_JK in production environment and
>>>>> keep getting this error in error log. I do google search and find
>>>>> lots of persons asking this question but no answer. Can anybody
>>>>> having experience with this shed a light on what it might be and
>>>>> how to resolve it?
>>>>>
>>>>> Thanks a lot,
>>>>>
>>>>> Kevin Song
>>>>
>>>>
>>>>
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>>
>>
>>
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