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[Eugene Nikanorov <enikanorov@xxxxxxxxxxxx>]

** No longer affects: neutron

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https://bugs.launchpad.net/bugs/1231657

Title:
  DB2 disconnect not handled pessimistically

Status in OpenStack Image Registry and Delivery Service (Glance):
  In Progress

Bug description:
  Only MySQL server disconnect is being handled pessimistically by adding a pool checkout listener to the sqlalchemy engine.
  Since DB2 connection pool is not handled pessimistically, we get the following error after  a temporarily disconnect of DB2 server that is already up and running:

  2013-09-15 13:49:48.274 1013 TRACE nova.api.openstack
  OperationalError: (OperationalError) ibm_db_dbi::OperationalError:
  [IBM][CLI Driver] SQL30081N  A communication error has been detected.
  Communication protocol being used: "TCP/IP".  Communication API being
  used: "SOCKETS".  Location where the error was detected:
  "172.17.35.52".  Communication function detecting the error: "send".
  Protocol specific error code(s): "110", "*", "*".  SQLSTATE=08001
  SQLCODE=-30081

  To avoid this error DB2 needs to be included in the logic to handle
  the connections pessimistically.

  To recreate in glance:
  Run glance index and make sure it is working
  Restart DB2 server
  Run glance index again, you will see error above.

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