Connections stacking between tomcat and nginx

[Thomas Boniface <th...@stickyads.tv>]

Hi,

We have a setup where tomcat is behind nginx and in some case the maximum
number of connection is reached between these two.  These connections are
in close wait state and a tomcat thread dump shows no blocking on its side.

I tried to check the connections status using jmxproxy. I was able see the
number of active connection but it can find out any details of what are
connections doing or what their status are internally for tomcat. Are these
kind of details available using JMX or is there any other path I could
follow in order to have more details on the connection state at tomcat
level ?

Thanks,
Thomas

Re: Connections stacking between tomcat and nginx

[Christopher Schultz <ch...@christopherschultz.net>]

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Thomas,

On 3/4/15 2:26 PM, Thomas Boniface wrote:
> We have a setup where tomcat is behind nginx and in some case the
> maximum number of connection is reached between these two.  These
> connections are in close wait state and a tomcat thread dump shows
> no blocking on its side.

What does your <Connector> configuration look like?

What does your Nginx configuration look like (I've never used Nginx
with Tomcat before).

How many web servers do you have? How many Tomcat servers?

> I tried to check the connections status using jmxproxy. I was able
> see the number of active connection but it can find out any details
> of what are connections doing or what their status are internally
> for tomcat. Are these kind of details available using JMX or is
> there any other path I could follow in order to have more details
> on the connection state at tomcat level ?

You can take thread dumps[1] to find out what those threads are doing.

- -chris

[1]
http://wiki.apache.org/tomcat/HowTo#How_do_I_obtain_a_thread_dump_of_my_running_webapp_.3F
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