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[yalei wang <yalei.wang@xxxxxxxxx>]

Public bug reported:

Neutron has already been able to make the agentless driver receive the security
group BEFORE/AFTER event by neutron callback logic[1]. But this logic still
lacks the precommit function, like in Ml2 mechanism driver, which guarantees that the
mechanism driver DB and neutron DB operation are in the same transaction.
Because the MD may want to have the event callback function and hope its own DB
operation in the same transaction with neutron securitygroup db.

Another problem is that there is no guarantee that at least one MDs will handle
a security group event. May other extension like QOS have the similar problem.


more info could be find here
https://review.openstack.org/#/c/240356/5/

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: rfe

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https://bugs.launchpad.net/bugs/1518087

Title:
  add the precommit primitive for security groups

Status in neutron:
  New

Bug description:
  Neutron has already been able to make the agentless driver receive the security
  group BEFORE/AFTER event by neutron callback logic[1]. But this logic still
  lacks the precommit function, like in Ml2 mechanism driver, which guarantees that the
  mechanism driver DB and neutron DB operation are in the same transaction.
  Because the MD may want to have the event callback function and hope its own DB
  operation in the same transaction with neutron securitygroup db.

  Another problem is that there is no guarantee that at least one MDs will handle
  a security group event. May other extension like QOS have the similar problem.

  
  more info could be find here
  https://review.openstack.org/#/c/240356/5/

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