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[Bug 1605793] [NEW] Calculate MTU on every network fetch instead of on create

 

Public bug reported:

https://review.openstack.org/336805
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.
Your project "openstack/neutron" is set up so that we directly report the documentation bugs against it. If this needs changing, the docimpact-group option needs to be added for the project. You can ask the OpenStack infra team (#openstack-infra on freenode) for help if you need to.

commit a984f9554cdcbe93c840a1d8f5c04302e9331e79
Author: Ihar Hrachyshka <ihrachys@xxxxxxxxxx>
Date:   Sat Jul 2 17:30:21 2016 +0200

    Calculate MTU on every network fetch instead of on create
    
    Today, existing networks may not reflect MTU configured for
    neutron-server, if they were created when neutron-server was using
    different MTU setup for its infrastructure, or when it was using bad
    default values for network MTUs (specifically, before Mitaka, all networks
    were getting MTU = 0 by default, disabling both advertisement and data
    path MTU size enforcement).
    
    This patch stops persisting MTU in the database on network create and
    instead calculate it on every network resource fetch.
    
    DocImpact Now changes to MTU configuration options immediately affect
              existing network MTUs, not just new networks.
    
    UpgradeImpact Existing networks with invalid MTU persisted in database
                  may change their MTU values to reflect configuration.
    
    Change-Id: Iee4f5037bf10b73ba98464143b183aacb59c22f2
    Closes-Bug: #1556182

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: doc neutron

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https://bugs.launchpad.net/bugs/1605793

Title:
      Calculate MTU on every network fetch instead of on create

Status in neutron:
  New

Bug description:
  https://review.openstack.org/336805
  Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.
  Your project "openstack/neutron" is set up so that we directly report the documentation bugs against it. If this needs changing, the docimpact-group option needs to be added for the project. You can ask the OpenStack infra team (#openstack-infra on freenode) for help if you need to.

  commit a984f9554cdcbe93c840a1d8f5c04302e9331e79
  Author: Ihar Hrachyshka <ihrachys@xxxxxxxxxx>
  Date:   Sat Jul 2 17:30:21 2016 +0200

      Calculate MTU on every network fetch instead of on create
      
      Today, existing networks may not reflect MTU configured for
      neutron-server, if they were created when neutron-server was using
      different MTU setup for its infrastructure, or when it was using bad
      default values for network MTUs (specifically, before Mitaka, all networks
      were getting MTU = 0 by default, disabling both advertisement and data
      path MTU size enforcement).
      
      This patch stops persisting MTU in the database on network create and
      instead calculate it on every network resource fetch.
      
      DocImpact Now changes to MTU configuration options immediately affect
                existing network MTUs, not just new networks.
      
      UpgradeImpact Existing networks with invalid MTU persisted in database
                    may change their MTU values to reflect configuration.
      
      Change-Id: Iee4f5037bf10b73ba98464143b183aacb59c22f2
      Closes-Bug: #1556182

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