Cells Layout (v2) in nova doc misleading about upcalls

Bug #1742421 reported by Liam Young
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
OpenStack Compute (nova)
Fix Released
Undecided
Liam Young

Bug Description

- [X] This doc is inaccurate in this way: Documentation suggests nova v2 cells do not make 'upcalls' but they do when talking to the placement api.
- [ ] This is a doc addition request.
- [ ] I have a fix to the document that I can paste below including example: input and output.

It is important to note that services in the lower cell boxes
only have the ability to call back to the placement API and no other
API-layer services via RPC, nor do they have access to the API database
for global visibility of resources across the cloud. This is intentional
and provides security and failure domain isolation benefits, but also has
impacts on somethings that would otherwise require this any-to-any
communication style. Check the release notes for the version of Nova you
are using for the most up-to-date information about any caveats that may be
present due to this limitation.

-----------------------------------
Release: 17.0.0.0b3.dev323 on 2018-01-09 21:52
SHA: 90a92d33edaea2b7411a5fd528f3159a486e1fd0
Source: https://git.openstack.org/cgit/openstack/nova/tree/doc/source/user/cellsv2-layout.rst
URL: https://docs.openstack.org/nova/latest/user/cellsv2-layout.html

Revision history for this message
OpenStack Infra (hudson-openstack) wrote : Fix proposed to nova (master)

Fix proposed to branch: master
Review: https://review.openstack.org/532491

Changed in nova:
assignee: nobody → Liam Young (gnuoy)
status: New → In Progress
Revision history for this message
OpenStack Infra (hudson-openstack) wrote : Fix merged to nova (master)

Reviewed: https://review.openstack.org/532491
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=30786b892e45602d76cea63ca4ae1172fb2e063e
Submitter: Zuul
Branch: master

commit 30786b892e45602d76cea63ca4ae1172fb2e063e
Author: Liam Young <email address hidden>
Date: Wed Jan 10 11:06:37 2018 +0000

    Add exception to no-upcall note of cells doc

    The cells v2 layout documentation clearly states that there are no
    upcalls from cells back to the central API services. This mislead
    me for sometime as I could not fathom how a compute node in a cell
    was supposed to report its resource info.

    It turns out nova looks up the placement service in the keystone
    catalogue and contacts it directly which to my mind is an upcall. I
    wonder if the author of the not felt that the placement service is
    not really part of nova?

    Change-Id: If14be8b182f0af4e4e6641046fec638c07e26546
    Closes-Bug: #1742421

Changed in nova:
status: In Progress → Fix Released
Revision history for this message
OpenStack Infra (hudson-openstack) wrote : Fix included in openstack/nova 17.0.0.0rc1

This issue was fixed in the openstack/nova 17.0.0.0rc1 release candidate.

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