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[Roman Podoliaka <rpodolyaka@xxxxxxxxxxxx>]

Public bug reported:

In DB API code we have a notion of 'public' and 'private' methods. The
former are conceptually executed within a *single* DB transaction and
the latter can either create a new transaction or participate in the
existing one. The whole point is to be able to roll back the results of
DB API methods easily and be able to retry method calls on connection
failures. We had a bp (https://blueprints.launchpad.net/nova/+spec/db-
session-cleanup) in which all DB API have been re-factored to maintain
these properties.

instance_create() is one of the methods that currently violates the
rules of 'public' DB API methods and creates a concurrent transaction
implicitly.

** Affects: nova
     Importance: Undecided
     Assignee: Roman Podoliaka (rpodolyaka)
         Status: New


** Tags: db

** Changed in: nova
     Assignee: (unassigned) => Roman Podoliaka (rpodolyaka)

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https://bugs.launchpad.net/bugs/1362233

Title:
  instance_create() DB API method implicitly creates additional DB
  transactions

Status in OpenStack Compute (Nova):
  New

Bug description:
  In DB API code we have a notion of 'public' and 'private' methods. The
  former are conceptually executed within a *single* DB transaction and
  the latter can either create a new transaction or participate in the
  existing one. The whole point is to be able to roll back the results
  of DB API methods easily and be able to retry method calls on
  connection failures. We had a bp
  (https://blueprints.launchpad.net/nova/+spec/db-session-cleanup) in
  which all DB API have been re-factored to maintain these properties.

  instance_create() is one of the methods that currently violates the
  rules of 'public' DB API methods and creates a concurrent transaction
  implicitly.

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