Problem with connectors

[Martin Spinassi <ma...@gmail.com>]

I've been trying to implement apache2 + connectors + tomcat on our
servers, put keep having disconnections from connectors and tomcat.

Here I post some output from jk_mod_log:

own, stopped or network problems (errno=110)
[Fri Nov 07 16:32:18.585 2008] [31998:670424352] [error]
ajp_get_reply::jk_ajp_common.c (1884): (worker1) Timeout with waiting
reply from tomcat. Tomcat is down, stopped or network problems
(errno=110)
[Fri Nov 07 16:32:18.710 2008] [31982:670424352] [info]
ajp_service::jk_ajp_common.c (2407): (worker1) sending request to tomcat
failed (recoverable), because of reply timeout (attempt=1)
[Fri Nov 07 16:32:18.710 2008] [31982:670424352] [error]
ajp_service::jk_ajp_common.c (2426): (worker1) connecting to tomcat
failed.
[Fri Nov 07 16:32:18.710 2008] [31982:670424352] [info]
jk_handler::mod_jk.c (2476): Service error=-10 for worker=worker1
[Fri Nov 07 16:32:18.743 2008] [32102:670424352] [info]
ajp_service::jk_ajp_common.c (2407): (worker1) sending request to tomcat
failed (recoverable), because of reply timeout (attempt=1)
[Fri Nov 07 16:32:18.743 2008] [32102:670424352] [error]
ajp_service::jk_ajp_common.c (2426): (worker1) connecting to tomcat
failed.



And makes tomcat stops responding. 


Tomcat and apache are in the same machine, and they communicate each
other with loopback, so net problems are not an issue.


May be too many connections are made from apache to tomcat? Can I
configure max connections for a worker?


If I stop apache and make tomcat listen on port 80, it works smoothly
(even duplicating connections with jmeter!).




Any idea is really appreciated, I just can't figure out how to solve
this.



Thanks to everyone.

Cheers,

Martín


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Re: Problem with connectors

[Rainer Jung <ra...@kippdata.de>]

Martin Spinassi schrieb:
> I've been trying to implement apache2 + connectors + tomcat on our
> servers, put keep having disconnections from connectors and tomcat.
> 
> Here I post some output from jk_mod_log:
> 
> own, stopped or network problems (errno=110)
> [Fri Nov 07 16:32:18.585 2008] [31998:670424352] [error]
> ajp_get_reply::jk_ajp_common.c (1884): (worker1) Timeout with waiting
> reply from tomcat. Tomcat is down, stopped or network problems
> (errno=110)
> [Fri Nov 07 16:32:18.710 2008] [31982:670424352] [info]
> ajp_service::jk_ajp_common.c (2407): (worker1) sending request to tomcat
> failed (recoverable), because of reply timeout (attempt=1)
> [Fri Nov 07 16:32:18.710 2008] [31982:670424352] [error]
> ajp_service::jk_ajp_common.c (2426): (worker1) connecting to tomcat
> failed.
> [Fri Nov 07 16:32:18.710 2008] [31982:670424352] [info]
> jk_handler::mod_jk.c (2476): Service error=-10 for worker=worker1
> [Fri Nov 07 16:32:18.743 2008] [32102:670424352] [info]
> ajp_service::jk_ajp_common.c (2407): (worker1) sending request to tomcat
> failed (recoverable), because of reply timeout (attempt=1)
> [Fri Nov 07 16:32:18.743 2008] [32102:670424352] [error]
> ajp_service::jk_ajp_common.c (2426): (worker1) connecting to tomcat
> failed.
> 
> 
> 
> And makes tomcat stops responding. 
> 
> 
> Tomcat and apache are in the same machine, and they communicate each
> other with loopback, so net problems are not an issue.
> 
> 
> May be too many connections are made from apache to tomcat? Can I
> configure max connections for a worker?
> 
> 
> If I stop apache and make tomcat listen on port 80, it works smoothly
> (even duplicating connections with jmeter!).

Give us your versions and configurations. We can't tell otherwise. You
might also look at

http://tomcat.apache.org/connectors-doc/generic_howto/timeouts.html

and especially use connect_timeout and prepost_timeout. If the error
message then is still "waiting reply", then you most likely have a
problem in your application, namely things taking to long. Add a Tomcat
access log valve with a custom pattern including %D to log the actual
response times and check whether the are huge for some URLs. Look at
those URLs and try to guess, why those are slow.

You could also use Java Thread Dumps to inspect, what Tomcat (more
precisely: your webapp) is actually doing.

Regards,

Rainer

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