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[OpenStack Infra <1947974@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/c/openstack/neutron/+/814868
Committed: https://opendev.org/openstack/neutron/commit/8127221479834350465251839ab88056f4f64fb4
Submitter: "Zuul (22348)"
Branch:    master

commit 8127221479834350465251839ab88056f4f64fb4
Author: Rodolfo Alonso Hernandez <ralonsoh@xxxxxxxxxx>
Date:   Thu Oct 21 08:49:41 2021 +0000

    Check a namespace existence by checking only its own directory
    
    To check the existance of a namespace, instead of listing the
    namespaces directory (by default "/var/run/netns"), this patch
    directly checks the existence of the namespace directory, using
    "os.path.exists".
    
    This check is faster than listing the whole directory and avoids
    timeout problems as reported in the related bug.
    
    Closes-Bug: #1947974
    Change-Id: I558d50d28378beb3710d98a2113ff9549c82ae17


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1947974

Title:
  "network_namespace_exists"can timeout in loaded systems

Status in neutron:
  Fix Released

Bug description:
  The method "neutron.agent.linux.ip_lib.network_namespace_exists" can
  timeout in loaded systems. We have detected this problem during some
  capacity tests. During those tests, the controllers are creating and
  deleting networks; that implies the creation and deletion of DHCP
  namespaces "qdhcp-xxx" in the same hosts. Adding additional logs
  (tagged with "SK;"), we found this method was timing out.

  Snippet: https://paste.opendev.org/show/810132/

  New additional logs added: https://paste.opendev.org/show/810133/

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