[chef] Re: Race Conditions

[Noah Kantrowitz < >]

All Chef APIs are last-writer-wins at a per-object level.

--Noah

On Sep 27, 2013, at 1:44 AM, Greg Zapp 
<
 >
 wrote:

> Hello,
> 
> I have a few nagging questions about Chef.  One of them revolves around 
> potential race conditions in updating nodes and databags on Chef Server.  
> For the life of me I am unable to find any information on how Chef updates 
> node information on the server side.  Does it merge changed keys?  Does it 
> fully overwrite all json keys?  If a client run starts and then some 
> external force updates the node on the server, will node.save(s) on the 
> client overwrite that information?  What about data bags?
> 
> I would appreciate any information that could be provided on this topic.  
> I'm considering drastic measures to to my lack of understanding of the 
> internals:
> *Only nodes update their attributes
> *Databags have ONE writer, multiple readers
> *Desired state stored in data bags
> *Current state stored in node attributes or other data bags
> 
> @.@
> 
> 
> Thanks,
>    Greg

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