yahoo-eng-team team mailing list archive

[Huang Cheng <1791233@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

We are expected to get the same partial segment allocated for specified
network and physical_network by calling neutron.plugins.ml2.managers.TypeManager.allocate_dynamic_segment.


but there is a race condition:
1. Two processes call allocate_dynamic_segment function with specified
   network and physical_network simultaneously.
2. Two processes both retrieve no allocated segment, and both allocate
   a new partial segment indeed.
3. Two partial dynamic segments was allocated for the same network and
   physical_network.

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: allocate binding hierarchical ml2 partial port race segment

** Description changed:

- We are expected to get the same partial segment allocated for specified 
- network and physical_network by calling allocate_dynamic_segment.
+ We are expected to get the same partial segment allocated for specified
+ network and physical_network by calling neutron.plugins.ml2.managers.TypeManager.allocate_dynamic_segment.
  
- neutron.plugins.ml2.managers.TypeManager.allocate_dynamic_segment:
- https://pastebin.com/TGTpJaC8
  
  but there is a race condition:
- 1. Two processes call allocate_dynamic_segment function with specified 
-    network and physical_network simultaneously.
- 2. Two processes both retrieve no allocated segment, and both allocate 
-    a new partial segment indeed.
- 3. Two partial dynamic segments was allocated for the same network and 
-    physical_network.
+ 1. Two processes call allocate_dynamic_segment function with specified
+    network and physical_network simultaneously.
+ 2. Two processes both retrieve no allocated segment, and both allocate
+    a new partial segment indeed.
+ 3. Two partial dynamic segments was allocated for the same network and
+    physical_network.

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https://bugs.launchpad.net/bugs/1791233

Title:
  Redundant dynamic partial segments was allocated for the same network
  and physical_network

Status in neutron:
  New

Bug description:
  We are expected to get the same partial segment allocated for specified
  network and physical_network by calling neutron.plugins.ml2.managers.TypeManager.allocate_dynamic_segment.

  
  but there is a race condition:
  1. Two processes call allocate_dynamic_segment function with specified
     network and physical_network simultaneously.
  2. Two processes both retrieve no allocated segment, and both allocate
     a new partial segment indeed.
  3. Two partial dynamic segments was allocated for the same network and
     physical_network.

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