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

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

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https://bugs.launchpad.net/bugs/845866

Title:
  exception tracebacks are lost when using raise

Status in OpenStack Compute (Nova):
  Fix Released
Status in Oslo - a Library of Common OpenStack Code:
  Fix Released

Bug description:
  Since switching the db code to use an eventlet library, we can no
  longer re-raise exceptions if there is any db access in the exception
  handler.  There are a number of places in the code where this is done.

  we need to change instances of

  except <SomeException>:
    # code that uses db or rpc
    raise

  to:

  except <SomeException>:
    with excutils.save_and_reraise_exception():
      # code that uses db or rpc

  Also adding a logging.exception('useful message') is probably a good
  idea in most cases if the original traceback is important.

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