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[Victor Sergeyev <vsergeyev@xxxxxxxxxxxx>]

** Project changed: oslo-incubator => oslo.db

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https://bugs.launchpad.net/bugs/1283987

Title:
  Query Deadlock when creating >200 servers at once in sqlalchemy

Status in OpenStack Compute (Nova):
  In Progress
Status in Oslo Database library:
  In Progress

Bug description:
  Query Deadlock when creating >200 servers at once in sqlalchemy.

  --------

  This bug occurred when I test this bug: 
  https://bugs.launchpad.net/nova/+bug/1270725

  The original info is logged here:
  http://paste.openstack.org/show/61534/

  --------------

  After checking the error-log, we can notice that the deadlock function
  is 'all()' in sqlalchemy framework.

  
  Previously, we use '@retry_on_dead_lock' function to retry requests when deadlock occurs.

  But it's only available for session deadlock(query/flush/execute). It
  doesn't cover some 'Query' actions in sqlalchemy.

  
  So, we need to add the same protction for 'all()' in sqlalchemy.

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