[Buildbot-devel] Scheduler maintenance windows?

Scott Lamb slamb at slamb.org
Wed May 10 03:58:37 UTC 2006

Update on this: the Perforce people gave us a complex procedure[*]  
for checkpointing without locking the server for an hour, so once we  
get it implemented, we won't need any buildbot workarounds. Not sure  
if this is a feature anyone else wants or not.

[*] - Essentially, you bootstrap a second server by copying a  
checkpoint over from the primary. Then periodically you get new  
checkpoints by rolling the journals on your primary server, copying  
the freshly-rolled journals to the second server, replaying them,  
then checkpointing there. Latest second server checkpoint + current  
primary server journal = current primary server state. In effect,  
it's the same as just checkpointing the primary one, but you never  
took it down and you might end up a lot more confused. It works if  
you're careful to get the details right.

On Apr 25, 2006, at 12:53 AM, Scott Lamb wrote:

> I'm considering a patch to Scheduler to make it avoid scheduling  
> anything during a specific window every night. Our Perforce server  
> gets backed up nightly and runs a checkpoint, which *locks* the  
> database for a ridiculous long time - something like an hour. (The  
> Perforce people apparently don't believe in MVCC.) Builds during  
> this time fail like this:
>     starting p4
>     ...
>     command timed out: 1200 seconds without output, killing pid 5883
>     program finished with exit code -1
> I suppose I could crank up the timeout on that step a *lot*, but I  
> think it's better to just queue builds until the known window has  
> ended. Either by time or by the Perforce server's pre- and post- 
> backup scripts notifying buildbot in some way.
> Thoughts?
> -- 
> Scott Lamb <http://www.slamb.org/>
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Scott Lamb <http://www.slamb.org/>

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