Cédric Couralet wrote:
2014-02-10 22:34 GMT+01:00 André Warnier <a...@ice-sa.com>:
Jesse Barnum wrote:
On Feb 10, 2014, at 11:14 AM, Filip Hanik <fi...@hanik.com> wrote:
Jesse, mostly idle users and you wish to conserve resources. Use the
JkOptions +DisableReuse
on the mod_jk module. This will close connections after the request has
been completed. Many will tell you this will slow down your system since
new connections have to be created for each request. Usually, the
overhead
of this connection creation on a LAN is worth it. Measure for yourself.
Then you can go back to the regular blocking AJP connector, that will
perform a bit better as it doesn't have to do polling.
If I do this, can I keep a long keep-alive time on Apache? I need to
preserve that, because renegotiating SSL connections for every request
grinds the web server to a halt.
Also, I thought mod_jk and mod_ajp were two different things - how can I
use them both together?
Reply to the last phrase above :
mod_jk and mod_proxy_ajp are indeed two different things, but with a
similar purpose :
- each of them is a different add-on module to Apache httpd
- each one of them can be used as a connector between Apache httpd and
Apache Tomcat
- you generally use one or the other, not both at the same time
- they both connect to the same AJP <Connector> at the Tomcat level
- between Apache httpd and Tomcat, they both "speak the same language"
(the AJP protocol)
One difference is that mod_jk has quite a few more tunable options than
the mod_proxy_ajp module. The JkOptions mentioned above by Filip is one of
these mod_jk options.
I don't know what that JkOptions options does exactly, but from the name,
isn't it the same as the disableReuse option on mod_proxy?
http://httpd.apache.org/docs/current/mod/mod_proxy.html#proxypass
Then the OP could try that.
It looks that way. But this mod_proxy parameter (disablereuse, lowercase - I don't know if
it matters) is in a section "BalancerMember parameters", and it is not very clear if that
applies even if you are not using a balancer, or if it is forwarded to mod_proxy_ajp.
Some other options in the same page specify this explicitly, but this one doesn't.
I guess that Mark could answer that.
I think that it would help, in a general sense, if there was a general "translation table"
somewhere showing the AJP or other attributes or control parameters which exist, and to
what option they correspond in respectively mod_jk and mod_proxy/mod_proxy_ajp.
But due to the difficulty of figuring this out by trial and error, probably only the
respective developers can do that.
But I don't remember (and did not check earlier in the thread) if you
indicated that you are using mod_proxy_ajp.
And to answer the previous question : yes, I believe that you can keep a
long keep-alive in Apache httpd, independently of how httpd connects to
Tomcat.
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