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[Kevin Benton <1556178@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

The retry decorator doesn't clear the session between each retry. This
is normally not an issue; however, if some called code holds onto a
reference a reference of a DB object that will conflict with a newly
created one, we will get errors like the following:

FlushError: New instance <IPAllocation at 0x7fd98001ce50> with identity
key (<class 'neutron.db.models_v2.IPAllocation'>, (u'10.0.0.2', u
'70dfccfd-f18a-423b-9323-095a38b301a9', u'4e0d6054-6f90-450d-
87d6-fb86fa194a91')) conflicts with persistent instance <IPAllocation at
0x7fd9805aa910>

** Affects: neutron
     Importance: High
     Assignee: Kevin Benton (kevinbenton)
         Status: New

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https://bugs.launchpad.net/bugs/1556178

Title:
  retry decorator doesn't clear session in context

Status in neutron:
  New

Bug description:
  The retry decorator doesn't clear the session between each retry. This
  is normally not an issue; however, if some called code holds onto a
  reference a reference of a DB object that will conflict with a newly
  created one, we will get errors like the following:

  FlushError: New instance <IPAllocation at 0x7fd98001ce50> with
  identity key (<class 'neutron.db.models_v2.IPAllocation'>,
  (u'10.0.0.2', u'70dfccfd-f18a-423b-9323-095a38b301a9', u'4e0d6054-6f90
  -450d-87d6-fb86fa194a91')) conflicts with persistent instance
  <IPAllocation at 0x7fd9805aa910>

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