On NodeIDs

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Hi all,

I'm a bit surprised by the restrictions on the NodeIDs:

     # check NodeID, if does not match is impossible to continue
     if ( $Self->{NodeID} !~ m{ \A \d+ \z }xms && $Self->{NodeID} > 0 && 
$Self->{NodeID} < 1000 ) {
         $Kernel::OM->Get('Kernel::System::Log')->Log(
             Priority => 'error',
             Message  => "NodeID '$Self->{NodeID}' is invalid!",
         );
         return;
     }

I'd love to use the hostname as the default NodeID, because then it 
would automatically work both in single node and cluster setups, and 
there would be no hassle allocating unique, integer node IDs, but the 
current restrictions disallow that.

What's the motivation for restricting the NodeIDs thusly? If security is 
a concern (and I see it is used as a cache key), maybe using 
md5hex($NodeID) would be a good solution?

Cheers,
Moritz

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