KomAjpServer

All,

I'm currently evaluating KomAjpServer
(http://www.squeaksource.com/KomAjpServer) as an alternative way to
doing regular reverse-proxying with apache.

It seemed to work w/o any problems until Linux complained about to many
open files. Checking with lsof it seems that KomAjpServer does not keep
a number of sockets open but instead closes sockets after one request -
so I'm accumulating a lot of half open sockets.

Does anybody have any experience with this?

CU,

Udo

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2009/12/9 Udo Schneider <[hidden email]>:
That's not really the idea behind AJP:
"To cut down on the expensive process of socket creation, the web
server will attempt to maintain persistent TCP connections to the
servlet container, and to reuse a connection for multiple
request/response cycles"

 [1] http://httpd.apache.org/docs/2.2/mod/mod_proxy_ajp.html

Cheers
Philippe
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Udo Schneider wrote:
> All,
>
> I'm currently evaluating KomAjpServer
> (http://www.squeaksource.com/KomAjpServer) as an alternative way to
> doing regular reverse-proxying with apache.

Perhaps it does not fit at all, but you also have Blackfoot (SimpleCGI
implementation) as an alternative way of serving Seaside:

http://map.squeak.org/packagebyname/blackfoot

It was a while since I worked on it but last time I played it worked
fine with Cherokee and it performs better than plain Kom, for some
reason it especially seems to handle load much, much more gracefully.

Nginx (lemme take a look... nah, still not fixed) has a rather messy
implementation, and it is a largely unmaintained addon, and although I
fixed a few bugs in the Nginx module (!) it never made it into upstream
(although I sent it). So unfortunately I don't think Nginx is a good
server for SCGI.

Lighttpd and Apache should hopefully work fine, but I haven't tested them.

regards, Göran

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Philippe Marschall schrieb:
> That's not really the idea behind AJP:
> "To cut down on the expensive process of socket creation, the web
> server will attempt to maintain persistent TCP connections to the
> servlet container, and to reuse a connection for multiple
> request/response cycles"
The was my understanding of AJP as well - however it seems that
something is going wrong. Either on the Apache or on the seaside side.
Even without a connection the number of half-open sockets increases over
time.

The same apache with a tomcat backend works fine - so I'll start
digging/debugging on the smalltalk side.

CU,

Udo

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Göran Krampe schrieb:
> Perhaps it does not fit at all, but you also have Blackfoot (SimpleCGI
> implementation) as an alternative way of serving Seaside:
>
> http://map.squeak.org/packagebyname/blackfoot
I'll check it - thanks.

> It was a while since I worked on it but last time I played it worked
> fine with Cherokee and it performs better than plain Kom, for some
 > [...]
> Nginx (lemme take a look... nah, still not fixed) has a rather messy
> implementation, and it is a largely unmaintained addon, and although I
 > [...]
Unfortunately Apache is a must in my setup.

CU,

Udo

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Am 2009-12-10 um 09:44 schrieb Udo Schneider:

You might consider talking to
Christopher.Schuster at student.hpi.uni-potsdam.de
who once started inplementing KomAJP.

So Long,
        -Tobias

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Udo Schneider wrote:
> Unfortunately Apache is a must in my setup.

Then you can try using mod_scgi! I never did that, but would be cool to
know how it works out.

regards, Göran

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Tobias Pape schrieb:
> You might consider talking to
> Christopher.Schuster at student.hpi.uni-potsdam.de
Thanks. Will do.

CU,

Udo

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Göran Krampe schrieb:
> Then you can try using mod_scgi! I never did that, but would be cool to
> know how it works out.
I'll try.

CU,

Udo


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2009/12/10 Udo Schneider <[hidden email]>:
Apache side is very unlikely. That part has seen and is still seeing a
ton of action. Are you on mod_jk or mod_proxy_ajp?

> Even without a
> connection the number of half-open sockets increases over time.
>
> The same apache with a tomcat backend works fine - so I'll start
> digging/debugging on the smalltalk side.

Wireshark supports AJP13 :-)

Cheers
Philippe
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Philippe Marschall schrieb:
> Apache side is very unlikely. That part has seen and is still seeing a
> ton of action. Are you on mod_jk or mod_proxy_ajp?
I'm currently using mod_proxy_ajp.

> Wireshark supports AJP13 :-)
That's good to know - I have to check whether I can capture packets on
the loopback interface with tcpdump. The machine I (am forced to) work
with is a stripped down linux machine for "security purposes" ... it's
amazing how much was stripped .... :-(

Thanks for your help.

CU,

Udo

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Udo Schneider schrieb: The WireShark idea was an excellent one!!!! I can now clearly see that
KomAjpServer handles one request and then "somebody in Squeak"
terminates the connection (TCP-FIN) - so I'd say it's definitely
something on the Squeak Side.

Let the debugging begin :-)

CU,

Udo

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