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[ChangBo Guo <guochbo@xxxxxxxxxx>]

** Also affects: ceilometer
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1258044

Title:
  Don't need session.flush in context managed by session in sqlalchemy

Status in OpenStack Telemetry (Ceilometer):
  In Progress
Status in OpenStack Identity (Keystone):
  In Progress

Bug description:
  Within the scope of a single method, keeping all the reads and writes within
  the context managed by a single session. In this way, the session's __exit__
  handler will take care of calling flush() and commit() for you.
  If using this approach, you should not explicitly call flush() or commit().
  See http://stackoverflow.com/questions/4201455/sqlalchemy-whats-the-difference-between-flush-and-commit

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