Puppet users - Oct 2014 - subscribe and refreshonly - expected behavior

Hello all,

My thanks in advance to anybody with thoughts on this.  I have a module in 
which I would like two resources to be applied/refreshed based on the 
change of their parent resource.  

The code looks something like this:

exec {'assume_default_domain':
      command     => "${pbis_bin_path}/config AssumeDefaultDomain
true",
      subscribe   => Exec['create_home_dir'],
      refreshonly => true,
    }
    
    exec {'user_domain_prefix':
      command     => "${pbis_bin_path}/config UserDomainPrefix
\"\" ",
      subscribe   => Exec['assume_default_domain'],
    }

When running a 'puppet agent -tvd' I get the following:

Notice: /Stage[main]/Pbis::Config/Exec[assume_default_domain]: Triggered 
'refresh' from 1 events
Info: /Stage[main]/Pbis::Config/Exec[assume_default_domain]: Scheduling 
refresh of Exec[user_domain_prefix]
Debug: /Stage[main]/Pbis::Config/Exec[assume_default_domain]: The container 
Class[Pbis::Config] will propagate my refresh event
Debug: Exec[user_domain_prefix](provider=posix): Executing 
'/opt/pbis/bin/config UserDomainPrefix "" '
Debug: Executing '/opt/pbis/bin/config UserDomainPrefix "" '
Notice: /Stage[main]/Pbis::Config/Exec[user_domain_prefix]/returns: 
executed successfully
Debug: /Stage[main]/Pbis::Config/Exec[user_domain_prefix]: The container 
Class[Pbis::Config] will propagate my refresh event
Debug: Exec[user_domain_prefix](provider=posix): Executing 
'/opt/pbis/bin/config UserDomainPrefix "" '
Debug: Executing '/opt/pbis/bin/config UserDomainPrefix "" '
Notice: /Stage[main]/Pbis::Config/Exec[user_domain_prefix]: Triggered 
'refresh' from 1 events
Debug: /Stage[main]/Pbis::Config/Exec[user_domain_prefix]: The container 
Class[Pbis::Config] will propagate my refresh event
Debug: Class[Pbis::Config]: The container Stage[main] will propagate my 
refresh event
Debug: Class[Pbis::Config]: The container Class[Pbis] will propagate my 
refresh event
Debug: Class[Pbis]: The container Stage[main] will propagate my refresh 
event
Debug: Finishing transaction 25871380
Debug: Storing state
Debug: Stored state in 0.06 seconds

As you can see, the 'user_domain_prefix' resource is firing twice and
I'm
not sure why.  If I change the resource and add a 'refreshonly', I get
the
desired result (resource only being applied once):

exec {'user_domain_prefix':
      command     => "${pbis_bin_path}/config UserDomainPrefix
\"\" ",
      subscribe   => Exec['assume_default_domain'],
      refreshonly => true,

Notice: /Stage[main]/Pbis::Config/Exec[assume_default_domain]: Triggered 
'refresh' from 1 events
Info: /Stage[main]/Pbis::Config/Exec[assume_default_domain]: Scheduling 
refresh of Exec[user_domain_prefix]
Debug: /Stage[main]/Pbis::Config/Exec[assume_default_domain]: The container 
Class[Pbis::Config] will propagate my refresh event
Debug: Exec[user_domain_prefix](provider=posix): Executing 
'/opt/pbis/bin/config UserDomainPrefix "" '
Debug: Executing '/opt/pbis/bin/config UserDomainPrefix "" '
Notice: /Stage[main]/Pbis::Config/Exec[user_domain_prefix]: Triggered 
'refresh' from 1 events
Debug: /Stage[main]/Pbis::Config/Exec[user_domain_prefix]: The container 
Class[Pbis::Config] will propagate my refresh event
Debug: Class[Pbis::Config]: The container Stage[main] will propagate my 
refresh event
Debug: Class[Pbis::Config]: The container Class[Pbis] will propagate my 
refresh event
Debug: Class[Pbis]: The container Stage[main] will propagate my refresh 
event
Debug: Finishing transaction 29272600
Debug: Storing state
Debug: Stored state in 0.06 seconds

My understanding is that 'subscribe' will both create a dependency and
will
require the refreshing of the dependent object, based on the subscribed 
objects' state.  I also understand 'refreshonly' to be a mechanism
used
when a dependent object is changed (sounds almost the same as subscribe 
except it doesn't create a dependency).  Based on my example above, I would 
expect 'subscribe' alone to satisfy my needs and I don't understand
why I
get duplicate refresh events when something is simply 'subscribed' but
only
one refresh event when a resource is set to both 'subscribe' and 
'refreshonly'.

Would anybody have a quick explanation for this one?

Thanks again for your help in advance.

Cheers,

Mike

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