nova/releasenotes/notes/over-quota-api-behavior-cha...

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issues:
- In 16.0.0 Pike release, quota limits are checked in a new
fashion after change 5c90b25e49d47deb7dc6695333d9d5e46efe8665
and a new config option ``[quota]/recheck_quota`` has been
added in change eab1d4b5cc6dd424c5c7dfd9989383a8e716cae5 to
recheck quota after resource creation to prevent allowing
quota to be exceeded as a result of racing requests. These
changes could lead to requests blocked by over quota resulting
in instances in the ``ERROR`` state, rather than no instance
records as before. Refer to https://bugs.launchpad.net/nova/+bug/1716706
for detailed bug report.