[openstack-dev] [nova] Belated nova newton midcycle recap

Matt Riedemann mriedem at linux.vnet.ibm.com
Mon Aug 1 21:26:41 UTC 2016

On 8/1/2016 4:19 PM, Matt Riedemann wrote:
> It's a little late but I wanted to get a high level recap of the nova
> newton midcycle written up for those that didn't make it.
> First off, thanks again to Intel for hosting and especially to Cindy
> Sirianni at Intel for making sure we were taken care of. We had about 40
> people each day in a single room so it was a little cramped but being
> the champions we are we survived.
> The full etherpad is here:
> https://etherpad.openstack.org/p/nova-newton-midcycle
> I won't go into all of the details about every topic because (a) there
> was a lot of discussion and a lot of topics and (b) I honestly didn't
> catch everything, so I'm going to go over the highlights/decisions/todos
> (in no particular order).
> * cells v2 progress/status check
> The aggregates and server group data migration changes are underway and
> being reviewed. Migrating quotas to the API DB needs work though and
> someone besides Mark Doffman (doffm) will probably need to pick that up.
> For cell0 only scheduler failures live there, so we talked about how
> those fit into the server list response. We decided that servers without
> a host will be sorted at the front of the list response, and servers
> with a list will be sorted after that. This will need to be documented
> behavior in the API and could be improved later with Searchlight. We
> would like someone to be a point person for interlocking with the
> Searchlight team and we thought Balazs Gibizer (gibi) would be a good
> person for this.
> Andrew Laski has a change up for migrating from non-cells to cells v2.
> We want to force people to upgrade to cells v2 in Newton so that we can
> land a breaking change in Ocata to block people that aren't on cells v2
> yet. Doing this is contingent on grenade testing. Dan Smith has the TODO
> to look at the grenade changes. We don't plan on grenade testing cells
> v1 to cells v2. We'll need to get docs changes for upgrades for the
> process of migrating to cells v2. Michael Still (mikal) said we needed
> to open bugs against the docs team for this.
> The goal for Newton with cells v2 is that an instance record will not be
> created until we pick a cell and we'll use the BuildRequest until that
> point, and listing/deleting instances during that window will still work
> as normal. For listing instances, we will prepend BuildRequests to the
> front of the list (unsorted). We'll also limit the sort_keys in the API,
> at least to excluded fields on joined tables - that can be fixed as a
> bug fix.
> For RPC/DB context switching, the infrastructure is in place but we
> probably won't use this in Newton. There is a problem with version caps
> and sending a new object to and old cell. There are a few proposed
> solutions and Dan Smith was looking at testing a solution for this, but
> we'll most likely end up documenting it for upgrades.
> * API policy in code
> Claudiu Belu has a patch up for a nova-manage command to check what APIs
> a given user can perform. This is a first step to eventually getting to
> a discoverable policy CLI and it also provides a debug tool for
> operators when API users get policy errors.
> We also said that any command for determining the effective policy of a
> deployment or checking duplicates should live in oslo.policy, not nova,
> since other projects are looking for the same thing, like Ironic. Nova
> wouldn't have a nova-manage command for this but would have an
> entrypoint. We also need to prioritize anything that needs to get into
> oslo.policy so we're not caught by the final non-client library release
> the week of 8/22.
> * API docs in tree
> Things are slow but that's mostly OK, we'll continue working on this
> past feature freeze since it's docs. And we'll probably schedule an
> api-ref docs review sprint early in September after feature freeze hits.
> * Proxy API deprecations
> We talked quite a bit about how to land the proxy API deprecation and
> network API changes in a single microversion, which actually happened
> with 2.36 last week.
> Most of the discussion was around how to handle the network API
> deprecation since if you're using nova0-network it's not a proxy. We
> didn't want to really case the network APIs though, and we wanted the
> additional signaling mechanism that the network APIs, and nova-network,
> are deprecated, so we ultimately decided to include nova-network and all
> network APIs in the 2.36 microversion for deprecation. The sticky thing
> is that today you can request <2.36 and the API still works. After
> nova-network is deleted from code, that will no longer work. Yes this is
> a backward incompatible change, but we wanted the further signaling of
> the removal rather than just yank it outright when the time comes.
> To ease some of the client experience, Dan Smith is working a change in
> python-novaclient to deprecate the network CLIs and if requesting
> microversion>=2.36 we'll fallback to 2.35 (or the latest available that
> still makes this work). So the network CLIs will be deprecated and emit
> a warning but continue to work even though API users will not be able to
> request >2.35 of those APIs.
> * API extension folding/removal
> There was a concern about losing policy checks and operators controlling
> features in their cloud via policy. For example, you can't disable file
> injection via policy anymore. There is a TODO here to send an email to
> the openstack-operators list as an FYI that we're removing policy for
> server attributes and if you're controlling the API capabilities via
> policy you might have a problem. The goal here is to disable the ability
> to inject things into the API response since that's a barrier to
> interoperability (and also make the code sane in the process).
> This work does appear to have stalled a bit though since Sean Dague
> (sdague) has been working on getting oslo.privsep working in our upgrade
> CI jobs.
> * Spec for user_id based policy enforcement
> https://review.openstack.org/#/c/324068/
> We agreed this was a regression and an important operator gap (discussed
> in threads in the operators ML) until we have hierarchical quota support
> in Nova, so we want to move forward with getting the limited support
> added back in Newton. TODOs here for John Garbutt, Andrew Laski and
> myself to review the spec.
> * os-vif integration
> https://review.openstack.org/#/c/269672/
> Jay Pipes and Sean Mooney are happy with the change, but it's blocked on
> sorting out the oslo.privsep/grenade issue (which is nearly complete now).
> * oslo.privsep/grenade
> This is old news given:
> http://lists.openstack.org/pipermail/openstack-dev/2016-July/099705.html
> And https://review.openstack.org/#/c/344450/
> But to summarize we have a least-terrible path forward on using privsep
> without making upgrade script exceptions in grenade and deployment tools
> for every project and every release that adds new privsep support. Sean
> Dague has been doing a lot of work on getting this done the last two
> weeks and it looks like we should be done by the end of this week:
> https://review.openstack.org/#/c/348250/
> This will allow nova to use the latest os-brick and os-vif libraries.
> * libvirt storage pools
> We talked quite a bit about CI coverage for live migration. Timofey
> Durakov was going to look into enabling NFS in our live migration job
> again. We were also going to change the multinode full job to only run
> the 2.1 microversion for live migration tests and let the live migration
> specific job run all of the microversions in the live migration tests
> (this is to avoid some duplication between the jobs).
> The libvirt-imagebackend refactor series is still ongoing and massive:
> https://review.openstack.org/#/q/topic:libvirt-imagebackend+status:open
> I've literally had to request that it be chunked up and not rebased
> altogether because of the strain it puts on infra's CI system. But for
> this we really just need more reviews from the core team. Dan Smith has
> been trying to whip up some of that to keep it moving.
> As for the libvirt storage pools spec, Paul Carlton reported that Maxim
> Nestratov had pointed out some issues with the spec regarding ploop
> devices, but that's since been sorted out and Maxim is +1 on the spec:
> https://review.openstack.org/#/c/310505/
> The deadline for getting the spec approved is this Thursday, 8/4. We
> agreed that the full change isn't going to make Newton at this rate, but
> we can try to get some of the early object code and tests done in Newton
> in parallel to the image backend work so that we have a head start on
> Ocata.
> * Get Me a Network
> The only remaining changes for this are the REST API microversion change
> (2.37):
> https://review.openstack.org/#/c/316398/
> Which is being tested by the Tempest test and devstack change:
> https://review.openstack.org/#/c/327901/
> But those should be in good shape for Newton.
> * Vendor metadata reboot
> We agreed that we still wanted mikal to keep working on this:

I hit send prematurely. Will have part deux published shortly.



Matt Riedemann

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