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[Matt Riedemann <mriedem@xxxxxxxxxx>]

This was fixed back on 2013/07/10, so it's in Havana.

** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1199468

Title:
  Race around info_cache and bw_usage updates

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  info_cache and bw_usage updates have the semantics of updating if
  exists, otherwise creating a new record.

  If two greenthreads call this method, it's possible they'll race and
  both attempt to create new records, resulting in DBDuplicateEntry
  exceptions.

  For both of these cases, first-one-wins appears to be an acceptable
  solution, so we can just swallow the exception.

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