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From Rainer Jung <rainer.j...@kippdata.de>
Subject Re: jkstatus - Error connecting to tomcat - ajp_process_callback write failed
Date Tue, 08 Sep 2009 13:18:15 GMT
On 08.09.2009 14:40, mateo-jl wrote:
> Does these workers options are valid with mod_jk2 (mod_jk2-2.0.43.dll) ? 
> (http://tomcat.apache.org/connectors-doc/reference/workers.html)

No, mod_jk2 is deprecated since many years. mod_jk is well maintained
and the preferred way to go.

> Do you think that the following message are relative to timeouts issues ?
> 
> "Error connecting to tomcat" (not necessarily the 4th) or ajp_process_callback write
failed.

Not directly, they are what they say, namely errors when establishing a
new TCP connection to the Tomcat AJP connector. Timeouts help in making
the system generally more stable.

Regards,

Rainer

>> Message du 07/09/09 11:43
>> De : "Rainer Jung" 
>> A : "Tomcat Users List" 
>> Copie à : 
>> Objet : Re: jkstatus - Error connecting to tomcat - ajp_process_callback write failed
>>
>>
>> On 04.09.2009 11:42, mateo-jl wrote:
>>> Hello everybody,
>>>
>>> i got many errors about mod_jk but i don't know whether it's the good forum ...
>>> I have configured 4 tomcat identical servers reached by a front server apache
through mod_jk.
>>> When I look at the jkstatus page, I can note a strange behaviour: only the same
server (4) is under loaded.
>>> Regular percentages are:
>>> 1st:30% , 2nd:29%, 3rd:28, 4th:13% (note: lbfactor is the same for the 4 workers)
>>
>> What are therse percentages?
>>
>>> I don't know which way I can scrutinize.
>>> I just can see a lot of errors within error.log:
>>> "Error connecting to tomcat" (not necessarily the 4th) or ajp_process_callback
write failed.
>>
>> Not good.
>>
>>> So, the question is, which are the first checkings at tomcat configuration I
can do ?
>>
>> Read about timeouts:
>>
>> http://tomcat.apache.org/connectors-doc/generic_howto/timeouts.html
>>
>> All attributes are listed on
>>
>> http://tomcat.apache.org/connectors-doc/reference/workers.html
>>
>>> Do you have an "how to" for interpreting jkstatus ?
>>
>> Not really. What about jkstatus do you want to interprete?
>>
>> There's a bit of information on
>>
>> http://tomcat.apache.org/connectors-doc/reference/status.html
>>
>>> or is there any other way, a kind of pure tomcat tool, to check the tomcat perfs.
>>
>> Regards,
>>
>> Rainer

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