hiera 5 backend failing with "Recursive lookup detected"

[tikafn]

Hello, I'm stuck with my hiera-puppetdb setup. All lookup requests are constantly failing in the "searching for lookup-options" sequence:

Hierarchy entry "Puppetdb Backend"
Searching for "lookup_options"
Recursive lookup detected in [lookup_options]

hiera.yaml:

version: 5

defaults:
datadir: "/etc/puppetlabs/code/hiera/%{environment}/data"

hierarchy:
- name: "Puppetdb Backend"
lookup_key: puppetdb_lookup_key

Versions:
Puppet 5.5.2
puppetdbquery 3.0.1
puppet-db 1.2.4
postgresql 9.6

Debug output looks good to me, no hints for any problems.
Any ideas / suggestions where to look at?

Thanks in advance!

[aptituz]

I have the same problem but I couldn't really figure out under which conditions it happens.

But the reason WHY it happens seems to be that the lookup in https://github.com/dalen/puppet-puppetdbquery/blob/master/lib/puppet/functions/puppetdb_lookup_key.rb is happening even when "lookup_options" is requested. Which causes puppet to lookup lookup_options and probably trying to lookup lookup_options implicitly again and again and again.

So the reason is probably to do something like

if key == "lookup_options"
    context.not_found
end

in the function just before the lookup.