Bug #1001780 “apt-get update size is too big” : Bugs : Launchpad itself

Bug Description

I ran a clean install to Ubuntu 12.04 and so far everything has been working well. I especially commend the Ubuntu team for this release.

I only noticed that the size of repository update is now about ~13MB. Normally, it is about this size for the first time you run apt-get update after a clean install and then ~ 23kb - 1300kb for subsequent updates. However now it looks like it gets 13MB and bigger every now and then.

Using us.archive.ubuntu.com archive, I see that the Universe Package files are being recreated a couple of times an hour, but contain the same content. The file modification date and expiration date, and in particular, the etag, are changing each time causing apt-get update to reload the Package file again even though it hasn't changed.

Launchpad shouldn't recreating the Package files when no changes have been made to the contained packages.

#http://askubuntu.com/questions/135818/the-apt-get-update-cache-size-is-too-big

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Curtis Hovey (sinzui) on 2012-05-19

affects:

launchpad → apt (Ubuntu)

Launchpad Janitor (janitor) wrote on 2012-05-20:

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in apt (Ubuntu):
status:	New → Confirmed

John S. Gruber (jsjgruber) on 2012-05-20

summary:

- apt-get update cache size is too big
+ apt-get update size is too big

zpletan (zpletan) wrote on 2012-05-20:

A look at us.archive.ubuntu.com/ubuntu/dists/$DIST/[main|universe]/binary-i386 reveals that timestamps on the package info for hardy, lucid, maverick, natty, oneiric, and precise are being updated. Based on this, I would say that the problem is *not* specific to Precise. This concurs with my experience; in addition to real and virtual machines I have with Precise, this happened on my virtual machine of Oneiric before I blew it away a few weeks ago.

John S. Gruber (jsjgruber) wrote on 2012-05-21:

Terminal logs of http headers showing changing modification times and md5sums of the unchanging files Edit (4.9 KiB, text/plain)

Terminal logs of http headers showing changing modification times and md5sums of the unchanging files. Included both archives.ubuntu.com and us.archives.ubuntu.com. A packet trace showed that apt is using a "If-Modified-Since" header which is being subverted. The problem applies to main and universe but not to, for example, the security repo.

John S. Gruber (jsjgruber) wrote on 2012-05-21:

Is this possibly related to the optimizations mentioned in https://lists.ubuntu.com/archives/ubuntu-devel/2011-December/034577.html ?

William Grant (wgrant) wrote on 2012-05-21:

It's not a Launchpad problem. From the master copy of the archive:

-rw-r--r-- 1 lp_publish lp_publish 1.5M Sep 20 2008 /srv/launchpad.net/ubuntu-archive/ubuntu/dists/hardy/main/binary-i386/Packages.gz

Since http://archive.ubuntu.com/ubuntu/dists/hardy/main/binary-i386/ shows the bad mtime, it's probably something in the internal mirroring pipeline.

But one could also argue that apt still shouldn't regrab the file, since Release still has the same hashes for it.

Changed in launchpad:
status:	New → Invalid

William Grant (wgrant) wrote on 2012-05-21:

https://rt.admin.canonical.com/Ticket/Display.html?id=53097 (Canonical-only link, sorry) filed to track the mirror script problem.

John S. Gruber (jsjgruber) wrote on 2012-05-21:

I've been able to circumvent this problem by touching the appropriate files in /var/lib/apt/lists/ right before updating the apt cache.

zpletan (zpletan) wrote on 2012-05-22:

@jsjgruber, if I touch the files, will they still be downloaded if info has been changed?

John S. Gruber (jsjgruber) wrote on 2012-05-22:

@zpletan, touching them stops them from being downloaded. You should only touch the files that haven't changed since you downloaded them. By appropriate files I'm speaking of the files that were frozen at the release of the release you are running (those are the ones giving people trouble until the bug is fixed). You shouldn't use the touch command on any others, or against Quantal--its main and universe repos are active.

In this case touching a file just says it was current at the time you run the touch command (it makes the last modification time the current time).

There's detail in: http://askubuntu.com/questions/135818/the-apt-get-update-cache-size-is-too-big

David T (ubuntuwiki-datmail) wrote on 2012-05-30:

#10

touching 4 files on 50+ servers every 60mins is not practical. Sure hope a patch appears soon. Problem started 4/26/2012 (+ or - a day), I saw the major spike in my bandwidth usage around there.

John S. Gruber (jsjgruber) wrote on 2012-05-30:

#11

A fix would save a lot of bandwidth for users, mirrors, and Canonical. A fix would be great. Most users don't know about any circumventions, of course, and many don't even realize there is a problem.

Nevertheless I'm afraid I don't understand your comment. Your system should normally be downloading from the repositories on just one server and you should be touching just these four files on your system. Am I missing something? If the directions on askubuntu.com aren't clear I'd like to clarify them.

David T (ubuntuwiki-datmail) wrote on 2012-05-30:

#12

I am feeling this bug so much because I am a specialized hosting provider and chose Ubuntu as my primary linux distro. I have 50+ individual servers in 2 sets of racks, all of them checking for security updates every 60 minutes.

I feel the 120GB in the last 25'ish days :/

J Phani Mahesh (phanimahesh) wrote on 2012-06-25:

#13

Suggestion:
----------------
How about using zsync for downloading the lists?
Practically feasible solution, with no additional server side overload.

@David: If you have 50 servers that poll for updates every 60 minutes, I suggest you set up a caching server. That saves a lot of bandwidth. I suggest squid-deb-proxy or something similar.

Ernst Kloppenburg (ernst-kloppenburg) wrote on 2012-07-17:

#14

could somebody please assign an adequate importance to this bug

David T (ubuntuwiki-datmail) wrote on 2012-07-17:

#15

I'm amazed that every ubuntu mirror hasn't gone up in arms about this bug. They must be feeling it. Went from 40k-13000k that's what a 325+ fold increase in their outbound bandwidth levels. They must have massive pipes and don't care. :/

Jane Atkinson (irihapeti) wrote on 2012-07-26:

#16

Not everyone has high-bandwidth plans. I'll probably have to move to a low-bandwidth plan shortly and downloading 12 MB or so daily is going to hurt.

William Grant (wgrant) wrote on 2012-08-07:

#17

The internal mirror script has been fixed to not clobber the timestamps for old files, so this should no longer be a big problem.

Greg A (etulfetulf) on 2012-08-07

affects:	apt (Ubuntu) → ubuntu
Changed in ubuntu:
status:	Confirmed → Fix Released

Martin Lee (hellnest) wrote on 2013-10-17:

#18

The issue is stille exist on 13.10

Javier P.L. (chilicuil) wrote on 2013-12-06:

#19

I've seen this issue again in Ubuntu 14.04 currently being developed. On every $ sudo apt-get update #even when they're run one after the other, apt-get keeps downloading 19.8MB~

apt:
  Installed: 0.9.13.1~ubuntu1
  Candidate: 0.9.13.1~ubuntu1
  Version table:
*** 0.9.13.1~ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/main i386 Packages
        100 /var/lib/dpkg/status

Alan (alanjas) wrote on 2014-02-04:

#20

I have the same problem in Ubuntu 14.04 (trusty).
I run apt-get update and every time it downloads 15,5 MB !!
Seeing the output, I see that every time downloads the same file!!
It's the SAME file because have exactly same size! Maybe only changes the timestamp..

there are some.. this are the first:

Des:1 http://security.ubuntu.com saucy-security Release.gpg [933 B]
Des:2 http://security.ubuntu.com saucy-security Release [49,6 kB]
Des:3 http://archive.ubuntu.com trusty Release.gpg [933 B]
Des:4 http://security.ubuntu.com saucy-security/main Sources [27,9 kB]
...
Des:8 http://security.ubuntu.com saucy-security/universe Sources [8.372 B]
Des:32 http://archive.ubuntu.com trusty/universe i386 Packages [5.878 kB]

Faheem Ahmed (faheem-webmaster) wrote on 2014-04-18:

#21

I'm also having this bug on Ubuntu 14.04 LTS
Each time I run 'sudo apt-get update' it fetches 22.5MB.

Dave (dv1) wrote on 2014-04-18:

#22

Likewise - Just upgraded to 14.04, and downloading 15.1MB per apt-get update (although not absolutely _every_ time, perhaps the first time each hour?)

(Need a new launchpad button for "This bug now affects me _again_")

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apt-get update size is too big

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