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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Changed in: nova
       Status: In Progress => Invalid

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https://bugs.launchpad.net/bugs/1788564

Title:
  Increase set_target_cell performance by refactor where we lock

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  There is a lock in:
  https://github.com/openstack/nova/blob/def4b17934a3b2cf783d0177d6a9632916dfd10f/nova/context.py#L363

  it is used to prevent from creating duplicated db and mq connections
  for racy context content switching, the rece condition actually only
  occours if and only if there is no infomation about this cell in the
  cache(first time call).

  As for the current implementation, we lock the whole call, which may
  affect performance.

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