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Re: Locks on the Bzr repository


From: Jason Rumney
Subject: Re: Locks on the Bzr repository
Date: Fri, 20 Aug 2010 00:12:30 +0800
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.8) Gecko/20100802 Thunderbird/3.1.2

 On 19/8/2010 11:40 PM, Stefan Monnier wrote:
A couple times now, I've had the following kind of message when trying
to commit:

Unable to obtain lock sftp://bzr.sv.gnu.org/srv/bzr/emacs/trunk/.bzr/branch/lock
held by address@hidden on host wanchan [process #23356]
locked 28 minutes, 51 seconds ago

The first time I thought it was a stale lock so I broke it, but then it
came right back, so I suspect it might be due to something else.
Could it be that bzr grabs the lock when you do "bzr commit" and keep it
held for as long as you're editing the commit message?

I don't think editing the commit message is the problem, but the fact that to do anything with the master repository involves downloading and/or uploading at least 4MB of data, on a connection which fluctuates between 0 and 100kb/s, mostly in the 6 - 20kb/s range.

If that's indeed the culprit, I think it's a misfeature of Bzr, but at
least we can workaround it by using "bzr commit -m<...>", which I would
then *strongly* recommend.

I think the misfeature is that we are still using sftp access, which might be OK for users in well connected parts of the world like US, Europe and Japan, but from here is unusably slow.






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