Naan bread, PowerDNS Design & Engineering
Posted by bert hubert Sun, 23 Apr 2006 20:44:00 GMT
There has been a recent paucity of pizza related posts, but I did manage to employ my fine pizza oven yesterday, this time to make Nan bread. Nans are usually made in a tandoor, a blisteringly hot clay oven. And while my passion for good food is well known, having a clay oven (traditionally submerged in the earth if I understand correctly) is going a bit far. But I do have a bilsteringly hot pizza oven. And indeed, I can now finally procude Nans that are somewhat crisp on the outside, yet chewy on the inside, exactly the way I like them.
PowerDNS 3.0 release followup
Since the release of PowerDNS 3.0 last Thursday, some big users have switched over. This has led to a good trickle of tiny bugs which were all addressed quickly. To note:
- The Debian Sarge 3.0r1 default kernel, 2.6.8, claims to support epoll but in fact appears not to do so. The epoll multiplexer now does a better job of testing itself at runtime, and falling back to select if needed.
- No difference was made between NXDOMAIN and NXRRSET - probably not very relevant, but a technical violation. This was a regression caused by an earlier fix. No good deed goes unpunished!
- Filedescriptors 0, 1 and 2 are closed when going to the background, but I can’t 100% guarantee there is no logging output to fd 2 during operations. These descriptors are now dupped to
/dev/zero. - Bad handling of malformed EDNS0 packets.
- Failed compilation on Solaris 10 i386, because Solaris decides to #define DS, messing up our support of the DS record type.
I’ll wait a few more days and do a 3.0.1 release with nothing but minimal changes that all address real problems. There is one report of an unexplained crash on Solaris around that I’d like to solve, but as there is only one report and it can’t be reproduced, this might be hard.
I have an endurance test running of a single PowerDNS instance which has processed half a billion packets so far, I intend to keep it running until it passes the 32-bit wraparound mark, just to check if my code is properly using the 64-bit variables I pass it.
PowerDNS Design and Engineering
I sat down for a few hours and documented the inner workings of the PowerDNS recursor here. I know I’ll be reading this documentation myself three months from now, I swap out memory really quickly. You don’t need to read this document in order to use PowerDNS, but if you want to contribute, it should be very helpful.
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