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* Update neutron from branch 'master'
  to 04694a3490844d0fa1b03326189c2ebe5c310afe
  - Merge "Add support for deleting ml2/ovn agents"
  - Add support for deleting ml2/ovn agents
    
    This adds support for deleting OVN controller/metadata agents.
    Behavior is undefined if the agents are still actually up as per
    the Agent API docs.
    
    As part of this, it is necessary to be able to tell all workers
    that the agent is gone. This can't be done by deleting the
    Chassis, because ovn-controller deletes the Chassis if it is
    stopped gracefully and we need to still display those agents as
    down until ovn-controller is restarted. This also means we can't
    write a value to the Chassis marking the agent as 'deleted'
    because the Chassis may not be there. And of course you can't
    use the cache because then other workers won't see that the
    agent is deleted.
    
    Due to the hash ring implementation, we also cannot naively just
    send some pre-defined event that all workers can listen for to
    update their status of the agent. Only one worker would process
    the event. So we need some kind of GLOBAL event type that is
    processed by all workers.
    
    When the hash ring implementation was done, the agent API
    implementation was redesigned to work around moving from having
    a single OVN Worker to having distributed events. That
    implementation relied on marking the agents 'alive' in the
    OVSDB. With large numbers of Chassis entries, this induces
    significant load, with 2 DB writes per Chassis per
    cfg.CONF.agent_down_time / 2 seconds (37 by default).
    
    This patch reverts that change and goes back to using events
    to store agent information in the cache, but adds support for
    "GLOBAL" events that are run on each worker that uses a particular
    connection.
    
    Change-Id: I4581848ad3e176fa576f80a752f2f062c974c2d1
This commit is contained in:
Zuul 2021-01-13 17:22:47 +00:00 committed by Gerrit Code Review
parent 29e407fc34
commit 3f34369b91
1 changed files with 1 additions and 1 deletions
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neutron

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Subproject commit d163629e9b1681c0d86b71cf7896637a7babcc65
Subproject commit 04694a3490844d0fa1b03326189c2ebe5c310afe