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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