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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: neutron
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1267291

Title:
  DB lock wait timeout is possible for metaplugin

Status in OpenStack Neutron (virtual network service):
  Fix Released

Bug description:
  There are some places that a target plugin's method is called in 
  'with context.session.begin(subtransaction=True)'.
  This causes 'lock wait timeout' error potentially. 
  --- error is like:
  OperationalError: (OperationalError) (1205, 'Lock wait timeout exceeded; try restarting transaction') ...snip
  ---

  For example say ml2 is target plugin. Ml2's mechanism drivers separates precommit and postcommit
  method so that 'lock wait timeout' error does not occur. 
  But it is meaningless if ml2 is used under metaplugin.

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