Re: warning: no common commits - slow pull

[Nix <nix@esperi.org.uk>]

On 11 Feb 2008, Florian Weimer spake thusly:

> * Len Brown:
>
>> But this second pull seems to have re-downloaded 172MB,
>> when it should have only needed the last few commits.
>
> I've got a linux-2.6 tree which is reasonable up to date, but which has
> been created by some acient GIT version.  I see the same behavior from
> time to time.  The second pull, after I've canceled the first one,
> usually downloads just the expected data.

I just saw it as well, doing a big update (most of the way from 2.6.23
to current tip):

loki 214 /usr/packages/linux/linux% git pull
remote: Counting objects: 118487, done.
remote: Compressing objects: 100% (22411/22411), done.
remote: Total 102959 (delta 85610), reused 97521 (delta 80449)
Receiving objects: 100% (102959/102959), 26.41 MiB | 70 KiB/s, done.
Resolving deltas: 100% (85610/85610), completed with 7493 local objects.
warning: no common commits
remote: Counting objects: 708160, done.
remote: Compressing objects: 100% (124705/124705), done.
Receiving objects:   9% (70213/708160), 25.33 MiB | 70 KiB/s

loki 215 /usr/packages/linux/linux% ls -l .git/objects/pack
total 240224
-r--r--r-- 1 compiler hackers   2651912 2008-02-11 20:44 pack-69c40f2970403946a75203cc393ecc2b1abf8aa3.idx
-r--r--r-- 1 compiler hackers  69189104 2008-02-11 20:44 pack-69c40f2970403946a75203cc393ecc2b1abf8aa3.pack
-r--r--r-- 1 compiler hackers  14719304 2007-12-02 16:01 pack-7eb87d068cee2214e4b0c5b6b571014654cbaaa4.idx
-rw-r--r-- 1 compiler hackers         0 2007-12-06 14:45 pack-7eb87d068cee2214e4b0c5b6b571014654cbaaa4.keep
-r--r--r-- 1 compiler hackers 157916633 2007-12-02 16:01 pack-7eb87d068cee2214e4b0c5b6b571014654cbaaa4.pack
-r--r--r-- 1 compiler hackers     11744 2007-12-14 22:55 pack-993c8617968f3d44603663e4a2915ee260236f91.idx
-r--r--r-- 1 compiler hackers   1004082 2007-12-14 22:55 pack-993c8617968f3d44603663e4a2915ee260236f91.pack


Oddly enough I then halted it: I have no desire to blow an extra 160Mb
of space on duplicates of objects I've already got.

Pullng again promptly grabbed 102791 objects (i.e. prety much the same
set again) as if the pack up there at the top of the directory listing
didn't even exist. (git-repack will happily clean up the duplicates for
me, I'm sure.)

That time, it worked:

loki 216 /usr/packages/linux/linux% git pull
remote: Counting objects: 118319, done.
remote: Compressing objects: 100% (22389/22389), done.
remote: Total 102791 (delta 85463), reused 97353 (delta 80303)
Receiving objects: 100% (102791/102791), 26.39 MiB | 91 KiB/s, done.
Resolving deltas: 100% (85463/85463), completed with 7494 local objects.
From git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
 * [new tag]         v2.6.24    -> v2.6.24
 * [new tag]         v2.6.24-rc1 -> v2.6.24-rc1
 * [new tag]         v2.6.24-rc2 -> v2.6.24-rc2
 * [new tag]         v2.6.24-rc3 -> v2.6.24-rc3
 * [new tag]         v2.6.24-rc4 -> v2.6.24-rc4
 * [new tag]         v2.6.24-rc5 -> v2.6.24-rc5
 * [new tag]         v2.6.24-rc6 -> v2.6.24-rc6
 * [new tag]         v2.6.24-rc7 -> v2.6.24-rc7
 * [new tag]         v2.6.24-rc8 -> v2.6.24-rc8
 * [new tag]         v2.6.25-rc1 -> v2.6.25-rc1
[...]

This is with git version 1.5.4.25.g7f255-dirty. (only local changes are
some makefile tweaks).

I've never seen this failure before with any earlier git version, but
that might just be coincidence.

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