Commits on Nov 5, 2019

1. Don't resolve references when being deleted …

   Per the comment, there's too high a chance we'll get stuck and not process the
   delete because we reference resources that are also being deleted. I considered:
   
   * Processing references at delete time but not blocking on accessor errors. I
     felt this introduced too much complexity for little gain compared to just not
     trying resolution at all.
   * Making AttributeReferencers no-ops when the field they would set already had a
     value. I think this is an avenue we should investigate (issue forthcoming) but
     it is awkward to implement with the current AttributeReferencer interface.
   * Enforcing ordered deletes, such that a referenced resource cannot be deleted
     (at least not by Crossplane) until its referencers have all been deleted. This
     is the most bulletproof, but also the most complicated solution and would
     require further design investigation to pursue.
   
   Signed-off-by: Nic Cope <negz@rk0n.org>

   

   negz committed Nov 5, 2019
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