On 23/11/11 19:27, Antony Mayi wrote:> Hello,
>
> just trying to understand the workload behind the compilation of
> catalogs puppet master is doing each time the client does a request to
> the master. I understand the clients send the facts to the master and
> the master based on the facts and the manifests compiles the catalog. I
> would expect that this can be optimized with some caching so if neither
> the manifest and the set of facts doesn''t change the compilation
of that
> catalog results to cache hit and that request is served significantly
> faster leaving lower load footprint then the first request or request
> after some changes in manifests or in facts. In reality I don''t
see any
> difference that would suggest some caching in the master, eg. eachtime
> the client contact the master the compilation takes about 6 seconds
> which seams be unbelievably long.
>
> can anyone please explain the way the master caches the catalogs or what
> are the reasons it doesn''t?
The master doesn''t cache any compiled catalogs. One of the reason is
that the facts change for each run (yes, uptime I''m looking to you),
and
the master doesn''t know which facts matters or not (regarding to change
in the compiled catalog, which I believe is an hard problem).
Check the "Optimize Catalog Compilation" section of this blog post for
a
workaround:
http://www.masterzen.fr/2010/03/21/more-puppet-offloading/
--
Brice Figureau
My Blog: http://www.masterzen.fr/
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