Date: Wed, 28 Jul 2010 13:15:42 +0000 (UTC) From: Marcin Wisnicki <mwisnicki+freebsd@gmail.com> To: freebsd-ports@freebsd.org Subject: Re: Strange contents on some ftp mirrors Message-ID: <i2pahu$dri$1@dough.gmane.org> References: <i2na4v$f3c$1@dough.gmane.org> <4c4fac09.Kkzz6V/G5TxaiQAZ%perryh@pluto.rain.com>
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On Tue, 27 Jul 2010 21:03:21 -0700, perryh wrote: > Marcin Wisnicki <mwisnicki+freebsd@gmail.com> wrote: >> At this very moment, french package mirror has INDEX newer than in >> other mirrors: >> > ... >> >> yet it does not have those packages. >> >> How could something like this happen ? > > By being examined while a resync was in process: evidently the new INDEX > file had been transferred but that package file (and likely others) were > still in transit or perhaps not even started yet. Mirroring is not an > instantaneous process. Yeah that was it, but it is really, really bad. Mirroring must be atomic (mirror to temporary directory then rename). Otherwise there is a large window of time every couple of days when upgrading packages will at best fail or leave you with broken system. I did binary upgrade with pkg_upgrade yesterday and half of my system was linked against wrong libintl version :( In fact atomic mirroring will not fix it completely, you must keep older versions of packages for at least a few hours after mirroring so anyone that started before mirroring was "commited" will have a chance to finish.
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