Re: [gentoo-user] Leap Second 'bug'
On Mon, Jul 2, 2012 at 12:35 AM, Pandu Poluan pa...@poluan.info wrote: Just wondering... did Saturday's Leap Second bit your infrastructure? Did you do something special (like Google did) to prevent chaos? 'Leap Second' Bug Wreaks Havoc Across Web | Wired Enterprise | Wired.com http://m.wired.com/wiredenterprise/2012/07/leap-second-bug-wreaks-havoc-with-java-linux/ Sent from Maxthon Mobile We only had one infrastructure VM go down. I know a guy who had to spend the hours of 2AM to 7AM dealing with it. -- :wq
Re: [gentoo-user] Leap Second 'bug'
On Mon, Jul 2, 2012 at 12:35 AM, Pandu Poluan pa...@poluan.info wrote: Just wondering... did Saturday's Leap Second bit your infrastructure? Did you do something special (like Google did) to prevent chaos? 'Leap Second' Bug Wreaks Havoc Across Web | Wired Enterprise | Wired.com http://m.wired.com/wiredenterprise/2012/07/leap-second-bug-wreaks-havoc-with-java-linux/ non-mobile version of the link: http://www.wired.com/wiredenterprise/2012/07/leap-second-bug-wreaks-havoc-with-java-linux/ -- :wq
Re: [gentoo-user] Leap Second 'bug'
On Mon, 2 Jul 2012 11:35:50 +0700 Pandu Poluan pa...@poluan.info wrote: Just wondering... did Saturday's Leap Second bit your infrastructure? Nope, that a murmur, not a peep, barely even a log entry anywhere. And no whinging customers (surprisingly!) Our ntp servers just synced with the upstream stratum and carried on business as usual I'd like to boast that my time servers are awesome and the team running them even more awesome, but the truth is this one took us by surprise. You fellows in the US and Europe might be amazed by this, but down here in Africa the leap-second wasn't announced AT ALL. A few folk here and there knew of it, that's all. Me? I had to find out from a Google news feed on Sunday evening. Did you do something special (like Google did) to prevent chaos? 'Leap Second' Bug Wreaks Havoc Across Web | Wired Enterprise | Wired.com http://m.wired.com/wiredenterprise/2012/07/leap-second-bug-wreaks-havoc-with-java-linux/Sent from Maxthon Mobile Rgds, -- Alan McKinnnon alan.mckin...@gmail.com
Re: [gentoo-user] Leap Second 'bug'
On Mon, Jul 2, 2012 at 9:09 AM, Alan McKinnon alan.mckin...@gmail.com wrote: On Mon, 2 Jul 2012 11:35:50 +0700 Pandu Poluan pa...@poluan.info wrote: Just wondering... did Saturday's Leap Second bit your infrastructure? Nope, that a murmur, not a peep, barely even a log entry anywhere. And no whinging customers (surprisingly!) Our ntp servers just synced with the upstream stratum and carried on business as usual I'd like to boast that my time servers are awesome and the team running them even more awesome, but the truth is this one took us by surprise. You fellows in the US and Europe might be amazed by this, but down here in Africa the leap-second wasn't announced AT ALL. A few folk here and there knew of it, that's all. Me? I had to find out from a Google news feed on Sunday evening. You should have been following me on Twitter. I went with a text-only take on the Brace yourselves meme. -- :wq
Re: [gentoo-user] Leap Second 'bug'
On Mon, 2 Jul 2012 11:32:45 -0400 Michael Mol mike...@gmail.com wrote: Just wondering... did Saturday's Leap Second bit your infrastructure? Being just a user of Linux desktop applications the leap-second issue has no relevance to my activities. However, I have read in several places that any potential problem on Linux systems had been traced to a bug that was fixed several kernel releases ago. Anyone who keeps up to date should have experienced nothing. Frank Peters
Re: [gentoo-user] Leap Second 'bug'
On Mon, 2 Jul 2012 11:32:45 -0400 Michael Mol mike...@gmail.com wrote: On Mon, Jul 2, 2012 at 9:09 AM, Alan McKinnon alan.mckin...@gmail.com wrote: On Mon, 2 Jul 2012 11:35:50 +0700 Pandu Poluan pa...@poluan.info wrote: Just wondering... did Saturday's Leap Second bit your infrastructure? Nope, that a murmur, not a peep, barely even a log entry anywhere. And no whinging customers (surprisingly!) Our ntp servers just synced with the upstream stratum and carried on business as usual I'd like to boast that my time servers are awesome and the team running them even more awesome, but the truth is this one took us by surprise. You fellows in the US and Europe might be amazed by this, but down here in Africa the leap-second wasn't announced AT ALL. A few folk here and there knew of it, that's all. Me? I had to find out from a Google news feed on Sunday evening. You should have been following me on Twitter. I went with a text-only take on the Brace yourselves meme. Sorry, no can do. I don't do twitter. It's not personal, I just have this pro-verbosity thing going :-) -- Alan McKinnnon alan.mckin...@gmail.com
Re: [gentoo-user] leap second
I do not have a solution to your question, but in general there has been some discussion in the press [UK] of late that covered this very issue. The link has some further links that may lead you to your answer. http://www.bbc.co.uk/radio4/science/thematerialworld_20051124.shtml stu On 25/12/05, Jonathan A. Kollasch [EMAIL PROTECTED] wrote: On Sat, Dec 24, 2005 at 07:33:26PM -0500, Philip Webb wrote: There will be a leap second between 051231 235959 060101 00 . Does anyone know how the time servers used by NTP handle this ? Is it just left to the local machine to realise it's 1 sec fast adjust over a few hours or does something else alert it to correct things ? If the former, it could create problems for those running experiments; if the latter, does anyone know how it is done ? The last leap second was 1998/9 , before NTP was widely used. http://en.wikipedia.org/wiki/Unix_time http://en.wikipedia.org/wiki/Talk:Unix_time These _might_ help you understand this confusing subject. For me they just gave me a headache. The best I can tell POSIX handling of time-keeping is just broken. In short, don't worry too much about it. If you really want to know what time it is use GPS time (a sane TAI-based system), then convert that to UTC. Jonathan Kollasch -- There are 10 types of people in this world: those who understand binary, those who don't --Unknown -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] leap second
On Sat, 24 Dec 2005 19:33:26 -0500 Philip Webb [EMAIL PROTECTED] wrote: There will be a leap second between 051231 235959 060101 00 . Does anyone know how the time servers used by NTP handle this ? Is it just left to the local machine to realise it's 1 sec fast adjust over a few hours or does something else alert it to correct things ? If the former, it could create problems for those running experiments; if the latter, does anyone know how it is done ? The last leap second was 1998/9 , According to the RFC there has always been a mechanism, but it was not originally automatic. In RFC958, http://rfc.net/rfc958.html, there is this reference 5.4. Leap Seconds A standard mechanism to effect leap-second correction is not a part of this specification. It is expected that the Leap Indicator bits would be set by hand in the primary reference clocks, then trickle down to all other clocks in the network, which would execute the correction at the specified time and reset the bits. The newer NTP standard is now RFC1305, http://rfc.net/rfc1305.html. From my brief look it seems that the leap seconds are listed in a file. The server then sets the leap indicator when needed. before NTP was widely used. Not sure about that, but even the later standard is now 13 years old. The original is 7 years older than that. I'd be surprised if a lot of permanently connected sites, eg Universities, haven't been using it for a long time now. However most home users wouldn't have had much use for it before the growth of lower rate broadband services. -- Ian. EOM -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] leap second
051225 Ian Hastie wrote: 24 Dec 2005 Philip Webb [EMAIL PROTECTED] wrote: There will be a leap second between 051231 235959 060101 00 . Does anyone know how the time servers used by NTP handle this ? Is it just left to the local machine to realise it's 1 sec fast adjust over a few hours or does something else alert it to correct things ? If the former, it could create problems for those running experiments; if the latter, does anyone know how it is done ? The last leap second was 1998/9 , The newer NTP standard is now RFC1305, http://rfc.net/rfc1305.html. The details are in Appx E : it seems a warning bit is set manually by the operator of the primary time server during the previous day one supposes -- hopes (smile) -- that local NTP clients receive it understand what it all means, thereby resetting the local clock. Perhaps we should all watch our Gkrellms as 2006 flips into view ... -- ,, SUPPORT ___//___, Philip Webb : [EMAIL PROTECTED] ELECTRIC /] [] [] [] [] []| Centre for Urban Community Studies TRANSIT`-O--O---' University of Toronto -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] leap second
On Sun, 25 Dec 2005 06:59:20 -0500 Philip Webb [EMAIL PROTECTED] wrote: The details are in Appx E : it seems a warning bit is set manually by the operator of the primary time server during the previous day Seems like I should have looked more carefully. one supposes -- hopes (smile) -- that local NTP clients receive it understand what it all means, thereby resetting the local clock. That's looks like the way it works. Certainly more accurate then waiting for the new time to cascade through the layers. Perhaps we should all watch our Gkrellms as 2006 flips into view ... What else would we all be doing then?! *8) Then again you're in Canada and the leap second is being added at 23:59:59 UTC. That means in your local time it'll be hours before the end of the year. Of course there's another site I should have mentioned too. All the information on NTP you could ever want at http://www.ntp.org/. -- Ian. EOM -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] leap second
There is a good article on current thinking in Washington Post : http://www.washingtonpost.com/wp-dyn/content/article/2005/12/25/AR2005122500496_pf.html It doesn't mention NTP, but that's implicit in the anti-leap position. -- ,, SUPPORT ___//___, Philip Webb : [EMAIL PROTECTED] ELECTRIC /] [] [] [] [] []| Centre for Urban Community Studies TRANSIT`-O--O---' University of Toronto -- gentoo-user@gentoo.org mailing list
Re: [gentoo-user] leap second
On Sat, Dec 24, 2005 at 07:33:26PM -0500, Philip Webb wrote: There will be a leap second between 051231 235959 060101 00 . Does anyone know how the time servers used by NTP handle this ? Is it just left to the local machine to realise it's 1 sec fast adjust over a few hours or does something else alert it to correct things ? If the former, it could create problems for those running experiments; if the latter, does anyone know how it is done ? The last leap second was 1998/9 , before NTP was widely used. http://en.wikipedia.org/wiki/Unix_time http://en.wikipedia.org/wiki/Talk:Unix_time These _might_ help you understand this confusing subject. For me they just gave me a headache. The best I can tell POSIX handling of time-keeping is just broken. In short, don't worry too much about it. If you really want to know what time it is use GPS time (a sane TAI-based system), then convert that to UTC. Jonathan Kollasch pgpJZyLNgRl9H.pgp Description: PGP signature
