Servicegroup check scheduling

[Titus Anderson]

I really don't have a use for this idea, yet, but I thought I'd throw it out
here and see what people think.  (I also don't know how hard this would be to
code -- I haven't dug that deeply into the scheduling code, yet.)

Here's a theoretical setup.  Say I have a number of hosts that all provide LDAP
services and also have other services monitored (it doesn't matter what, but
there need to be other services for this to be relevant).  With interleaved
checks, the point is to spread out checks across multiple hosts.  If the
interleaving factor works out exactly the right way, it's very possible that
every one of the LDAP services could be checked simultaneously.  For redundant
services, that's not necessarily desired behavior.

So, here's my idea.  Since we have servicegroups now, perhaps providing a
scheduling hint would be possible.  If I have 5 redundant LDAP services and I
want at least one of those checked every 5 minutes, to guarantee that now, I'd
have to set the check_interval to 5 minutes.  However, if I could hint to the
scheduler to always interleave the checks of those services, I could
comfortably set the check_interval to between 20 and 25 minutes.

Of course, there's also the flip side -- you may have a set of services that
are related but not redundant that you want to always check together.  So it
would be better to parallelize those checks.

So, finally the point -- the idea is to add an option to servicegroups (and
possibly hostgroups for those that use scheduled host checks) that provides a
hint to the scheduler.  Something like scheduling_hint with options of
"interleave" or "parallelize".

Any thoughts?  Anyone have an idea of how difficult this would be to implement?
 Anyone find this useful or a complete waste of time and effort?

Thanks for listening.


		
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