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Issue 600 in cherokee: rule - high load

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Oct 14, 2009, 3:31 PM

Post #1 of 7 (91 views)
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Issue 600 in cherokee: rule - high load

Status: Accepted
Owner: ste...@konink.de
Labels: Type-Enhancement Priority-Medium OpSys-Linux Component-Logic
Component-Admin Usability

New issue 600 by ste...@konink.de: rule - high load
http://code.google.com/p/cherokee/issues/detail?id=600

rule_highload will implement several scenario's a user can match to in
order to redirect traffic to different servers if the load is just too high.

The basic scenario I want to have implemented:
- load (1m / 5m / 15m); because we REALLY don't want to do a systemcall
per incoming request, we might have to cache the one minute load just
somewhere in the server structure. [Windows equivalent?]

- use of the traffic counter.

If the maximum is exceeded the rule is matched, and and something can
happen in the handler behind it.

Potential problems; if we hit the famous 'cherokee doesn't like negative
rules...' then we call Alvaro...

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Nov 5, 2009, 8:47 PM

Post #2 of 7 (57 views)
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Re: Issue 600 in cherokee: rule - high load [In reply to]

Comment #1 on issue 600 by ste...@konink.de: rule - high load
http://code.google.com/p/cherokee/issues/detail?id=600

This initial patch should give support to Cherokee to store the load
variables up to
one minute. Now I wonder we could integrate this into the nonce timer
(hence also a 60s
delay). I'm totally open for that. I expect that for Windows, we probably
have to
figure out how to emulate this behavior.

Attachments:
cherokee-load-support.patch 2.7 KB

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Nov 6, 2009, 10:16 PM

Post #3 of 7 (58 views)
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Re: Issue 600 in cherokee: rule - high load [In reply to]

Updates:
Status: Started
Owner: tahers

Comment #2 on issue 600 by ste...@konink.de: rule - high load
http://code.google.com/p/cherokee/issues/detail?id=600

Implementation of the server code; we still lack an admin frontend. I hope
a skilled
Python engineer can make something functional. Ignore the above comment
about 'shared'
nonce timer. Although the load is calculated over the past minute, it is
(of course)
a continuous interval. I have reduced the update to 10s now. I think that
is pretty
reasonable.

For the gifted python engineers; this is what the module expects:
vserver!10!rule!700!match = load
vserver!10!rule!700!match!1min = 0.1
vserver!10!rule!700!handler = custom_error
vserver!10!rule!700!handler!error = 503

Where 1min, 5min, 15min are valid parameters. Leaving them out makes them
double max
on the server side. Any exceed in threshold results in a match.

Attachments:
cherokee-rule-load.patch 8.6 KB

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Nov 7, 2009, 5:09 AM

Post #4 of 7 (56 views)
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Re: Issue 600 in cherokee: rule - high load [In reply to]

Comment #3 on issue 600 by tahers: rule - high load
http://code.google.com/p/cherokee/issues/detail?id=600

Does this suit your needs, Stefan?

Attachments:
cherokee-rule-load-admin.patch 5.1 KB

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Nov 7, 2009, 7:48 AM

Post #5 of 7 (55 views)
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Re: Issue 600 in cherokee: rule - high load [In reply to]

Updates:
Status: WaitingQA
Owner: alobbs

Comment #4 on issue 600 by ste...@konink.de: rule - high load
http://code.google.com/p/cherokee/issues/detail?id=600

Seriously super Taher! Especially the nifty rendering in the virtual server
list :)

And because I like everyone here I have added a bonus patch so the load
also becomes
visible on the server info page.

In my opinion mergeable :)

Attachments:
cherokee-serverinfo-bonus.diff 2.6 KB

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Nov 7, 2009, 8:11 AM

Post #6 of 7 (55 views)
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Re: Issue 600 in cherokee: rule - high load [In reply to]

Updates:
Status: Started

Comment #5 on issue 600 by alobbs: rule - high load
http://code.google.com/p/cherokee/issues/detail?id=600

Bear with me here.. I'd like to check it out calmly.

Anyway, it looks pretty interesting, congrats in advance! :-)

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Nov 7, 2009, 10:29 AM

Post #7 of 7 (55 views)
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Re: Issue 600 in cherokee: rule - high load [In reply to]

Comment #6 on issue 600 by ste...@konink.de: rule - high load
http://code.google.com/p/cherokee/issues/detail?id=600

Since I was using a RWLOCK structure I just wondered if I unlocked it
properly. Sadly I
did not use it at all in the rule or in the server info page.

The attached patch combines everything above including my last fix.

Alvaro; in the server info page I put the load values on the stack to avoid
longer
locking then required. If you think this too complex, change it back the
original, and
lock/unlock it after the string functions.

Attachments:
load-final.patch 14.1 KB

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