[Pdns-users] TCP nameserver had error, cycling backend

[Daniel Greene - (mt) Media Temple]

Eugene,

I can't speak for the first, but:

Exception: unknown escape sequence

was a real performance killer for us, causing pdns to have to do some sort of internal reload (it reset its uptime, at least) and not serve queries for a couple of seconds. 

Evidently -- at least with a mysql backend -- it meant that we had escape sequences ("\") in our records somewhere. It turned out to be TXT records containing "\;". We found ours with: 

select * from records where content like '%\\\%';  



-- 
Daniel Greene
Systems Engineer, R&D
(mt) Media Temple, Inc
877 578.4000 x515

----- Original Message -----
From: "Eugene Pefti" <eugenep at w3media.net>
To: pdns-users at mailman.powerdns.com
Sent: Thursday, June 5, 2008 10:08:39 PM GMT -08:00 US/Canada Pacific
Subject: [Pdns-users] TCP nameserver had error, cycling backend

Hi folks,

What could this error message mean?

Jun  5 21:28:53 ns2 pdns[5778]: TCP nameserver had error, cycling backend:
Reading data: Connection reset by peer

They are numerous indeed. I believe they affect the overall performance.
And why would this stats show up in the log:

Jun  5 21:44:33 ns2 pdns_recursor[5200]: stats: 181355 questions, 86152
cache entries, 363 negative entries, 15% cache hits         
Jun  5 21:44:33 ns2 pdns_recursor[5200]: stats: throttle map: 41, ns speeds:
135                                                    
Jun  5 21:44:33 ns2 pdns_recursor[5200]: stats: outpacket/query ratio 166%,
1% throttled, 0 no-delegation drops                     
Jun  5 21:44:33 ns2 pdns_recursor[5200]: stats: 353 outgoing tcp
connections, 4 queries running, 18833 outgoing timeouts

Can these recursor erros be correlated with pdns errors?

And finally, can somebody interpret this even more numerous message:
Exception: unknown escape sequence

Eugene


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