Just some rough observations, I am using a visible Proxy configures through /etc/apt/ and also HTTP_PROXY running on "http://proxy:3128/"; since the early 1990ths. The Hash mismatch rarelly happened to me until I upgraded to Ubuntu 14.04 and since then I have it a lot on de.archive.ubuntu.com but still rarelly on eu/gb/nl mirrors. On most mirrors a quick fix is to clean /var/lib/apt/, /var/cache/squid and so on but on de mirror this seems to do nothing until the bug simply disappears after some days even without any interception from me.
I have the odd feeling that the de mirror is just exceptional erratic. Why am I using a caching proxy? Because it speeds up updating and installing while using multiple clients (once had more than 100 after one 2MBit line, right now still five). There is little need to cache lists, indexes, hashes, keys and so on, I am only interested in caching the deb Files so maybe there is some workaround to ease the strain on the proxy? -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. https://bugs.launchpad.net/bugs/972077 Title: apt repository disk format has race conditions Status in MAAS: New Status in apt package in Ubuntu: Confirmed Bug description: Apt archives are accessed over HTTP; this has resulted in a cluster of bugs (reported here, and upstream) about problems behind intercepting caches, problems with squid etc. There are 3 interlocking issues: A - mirror networks may be out of sync with each other (e.g. a file named on one mirror may no longer exist, or may not yet exist, on another mirror) B - updating files on a single mirror is not atomic - and even small windows of inconsistency will, given enough clients, cause headaches. C - caches exacerbate race conditions - when one happens, until the cached data expires, all clients of the cache will suffer from the race Solving this requires one of several things: - file system transactions - an archive format that requires only weakly ordered updates to the files at particular urls with the assumption that only one file may be observed to change at a time (because a lookup of file A, then B, may get a cache miss on A and a cache hit on B, so even if all clients strictly go A, then B, updates may still see old files when paths are reused). - super robust clients that repeatedly retry with progressively less cache friendly headers until they have a consistent view. (This is very tricky to do). It may be possible to do a tweak to the apt repository format though, which would allow publishing a race-free format in parallel with the existing layout, while clients migrate. To be safe against issue (A) the mirror network would need some care around handling of dns round- robin mirrors [to minimise the situation where referenced data is not available], but this should be doable - or alternatively clients doing 'apt-get update' may need to be willing to retry to accommodate round- robin skew. What would such an archive format look like? It would have only one well known file name (e.g. Releases-2), which would be internally signed. Rather than signing e.g. Packages.gz, it would sign a uniquely named packages and sources file - e.g. Packages-$HASH.gz or Packages-$serialno.gz. Backwards compatibility is achieved by using the same filenames for deb's and the like. We need to keep writing Packages.gz though, and Releases, until we no longer worry about old apt clients. We can optimise disk space a little by making Packages.gz a symlink to a Packages-$HASH.gz (and so on for Sources..), but it may be simpler and less prone to unexpected behaviour to keep using regular files. tl;dr * Unique file names for all unique file content with one exception * Releases-2, a self-signed file that provides hashes and names the index files (Packages, Sources, Translations etc) * Coexists with existing archive layout To manage notifications about this bug go to: https://bugs.launchpad.net/maas/+bug/972077/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
