Squid: WARNING: All url_rewriter processes are busy.

[Escorpiom]

In the Squid logs this message appears:

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WARNING: All url_rewriter processes are busy.
WARNING: up to 15 pending requests queued
Consider increasing the number of url_rewriter processes to at least 20 in your config file.
I looked in squid.conf.mas and at line 31 it states:

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$urlRewriteProgram => undef
How can I define the urlRewriteProgram and subsequently, get rid of the errors?

Cheers.

Add some extra info:
I found  this on the web, it seems that on Linux the package can be compiled (or should I say "build") with these options

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Squid 2.6: --with-maxfd=65536
Squid 3.x: --with-filedescriptors=65536
replace 65536 with the number of rewriters you want.
This is annoying because everytime it happens, it stalls pages loading and the delay is noticeable.
I suspect that our Zentyal Squid wasn't compiled with this option. I would really like some feedback from the devs, I'm willing to open a bugreport in the tracker if it's necessary.

[tunsa]

Hello!
Whether it was possible to solve this problem?
If yes, please describe in detail how?
Version of squid 2.7
Or just the problem can be solved in assembling squid or have more options?
Thank you in advance

my log

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2015/10/23 16:37:56| Ready to serve requests.
2015/10/23 16:39:25| WARNING: All url_rewriter processes are busy.
2015/10/23 16:39:25| WARNING: up to 13 pending requests queued