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[Tetsuro Nakamura <nakamura.tetsuro@xxxxxxxxxxxxx>]

Public bug reported:

Some candidates are missing when multiple sharing provider have multiple
shared resources

Description
===========

There can be legitimately distinct allocation requests with the same combination of providers.
But placement filter out them if the combination of the providers in play is the same combination with that we already have tin he allocation requests 

Example
=========

CN(compute node):  
    - VCPU: 16

SHR1: a sharing provider in the same aggregate with CN)
    - CUSTOM_RC1: 4
    - CUSTOM_RC2: 8

SHR2(sharing provider2):
    - CUSTOM_RC1: 6
    - CUSTOM_RC2: 3

We ask for VCPU:1,CUSTOM_RC1:1,CUSTOM_RC2:1.

Expected: we should get the following two allocation requests:

[(rp=CN, resources=[VCPU: 1]),
 (rp=SHR1, resources=[CUSTOM_RC1: 1]),
 (rp=SHR2, resources=[CUSTOM_RC2: 1])]

[(rp=CN, resources=[VCPU: 1]),
 (rp=SHR1, resources=[CUSTOM_RC2: 1]),
 (rp=SHR2, resources=[CUSTOM_RC1: 1]),]

Actual: We get only one of those candidates, because the combination of
the rps is the same: CN1, SHR1, and SHR2.

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: placement

** Tags added: placement

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https://bugs.launchpad.net/bugs/1772243

Title:
  Some candidates are missing when multiple sharing provider have
  multiple shared resources

Status in OpenStack Compute (nova):
  New

Bug description:
  Some candidates are missing when multiple sharing provider have
  multiple shared resources

  Description
  ===========

  There can be legitimately distinct allocation requests with the same combination of providers.
  But placement filter out them if the combination of the providers in play is the same combination with that we already have tin he allocation requests 

  Example
  =========

  CN(compute node):  
      - VCPU: 16

  SHR1: a sharing provider in the same aggregate with CN)
      - CUSTOM_RC1: 4
      - CUSTOM_RC2: 8

  SHR2(sharing provider2):
      - CUSTOM_RC1: 6
      - CUSTOM_RC2: 3

  We ask for VCPU:1,CUSTOM_RC1:1,CUSTOM_RC2:1.

  Expected: we should get the following two allocation requests:

  [(rp=CN, resources=[VCPU: 1]),
   (rp=SHR1, resources=[CUSTOM_RC1: 1]),
   (rp=SHR2, resources=[CUSTOM_RC2: 1])]

  [(rp=CN, resources=[VCPU: 1]),
   (rp=SHR1, resources=[CUSTOM_RC2: 1]),
   (rp=SHR2, resources=[CUSTOM_RC1: 1]),]

  Actual: We get only one of those candidates, because the combination
  of the rps is the same: CN1, SHR1, and SHR2.

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