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RE: sync bug -> corrupted proxy repo

From: Jon Foster <Jon.Foster_at_cabot.co.uk>
Date: Fri, 15 Jan 2010 11:08:01 -0000

Hi,

Ryan Schmidt wrote:
> But Subversion blocks the commit until the post-commit is done.

That particular SVN client will be blocked. But if you have
two users committing at the same time, or if a user runs "svn"
twice in parallel, then the post-commit hook will be run in
parallel.

Here's how I tested this. I created a new repository with
a post-commit hook that takes 30 seconds to run. I then
checked that it works, and that a normal commit took 30
seconds. I then did two commits in parallel, and that took
30 seconds. This shows that the post-commit hook is
running in parallel - if it had been run in series, then
it would have taken 60 seconds for 2 commits. (I also
checked the output of "ps" and observed the two
"post-commit" processes running).

~$ mkdir svnscratch
~$ cd svnscratch/
~/svnscratch$ svn --version | head -n1
svn, version 1.6.8 (dev build)
~/svnscratch$ svnadmin create repo
~/svnscratch$ cat >repo/hooks/post-commit
#! /bin/bash
sleep 30
~/svnscratch$ chmod a+x repo/hooks/post-commit
~/svnscratch$ time repo/hooks/post-commit

real 0m30.004s
user 0m0.000s
sys 0m0.008s
~/svnscratch$ time svn mkdir -m "Test" file://`pwd`/repo/trunk

Committed revision 1.

real 0m30.030s
user 0m0.008s
sys 0m0.008s
~/svnscratch$ time ( svn mkdir -m "Test" file://`pwd`/repo/branches &
svn mkdir -m "Test" file://`pwd`/repo/tags )

Committed revision 2.
Committed revision 3.

real 0m30.069s
user 0m0.004s
sys 0m0.020s
~/svnscratch$

Kind regards,

Jon

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Received on 2010-01-15 12:08:41 CET

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