2016-01-08 21:53 GMT+08:00 Andrew Laski <and...@lascii.com>: > On 01/08/16 at 12:33pm, John Garbutt wrote: > >> On 8 January 2016 at 08:17, 少合冯 <lvmxhs...@gmail.com> wrote: >> >>> Hi, all >>> >>> Now I'm working on the migrations list/show API. >>> The new api defines migrations is a sub-collection of an instance. >>> GET v2.1/tenant_id/servers/server-id/migrations/migration-id >>> >>> I need to support the new cell API to get a migration of a specified >>> instance. >>> get_migration_by_instance_and_id >>> >>> I read up the nova cell doc. >>> http://docs.openstack.org/developer/nova/cells.html >>> >>> It tells us that, the migrations table will be API-level. >>> The instances table is Cell-level. >>> So does that means that we can do live migration cross cells? >>> >> >> In sort, you can't currently live-migrate between cells. >> >> So there is the current cells v1. When using cells v1 you will never >> be able to move between cells. In addition, when using nova-network, >> network assumptions generally mean IPs can't move between cells. >> > > Assuming a global network the limitation is just within Nova. There is no > mechanism for moving instance data from one cell database to another. And > it's not something that will be added since v1 is in a freeze. > > >> In cells v2, we were talking about ways that could happen. Its still >> hard, because you would need to copy the instance record between one >> cell database to another, with the API understanding how the move is >> going. Complexity best avoided, if possible. >> > > Cells v2 makes some architecture choices that will make it easier to > accomplish this. But it's not necessary to have for cells v2 so it's not > likely to be in place initially. > > >> And also this will affect my code. >>> If the migrations is API-level, so I do not need a cell name to get the >>> migrations info from DB. >>> >>> Or I need to get the cell name by the specified instance, and then get >>> the >>> migrations info by _TargetedMessage. >>> >> >> Afraid I don't have enough context from the rest of your email to >> answer these questions. >> > > I'm not entirely clear on the question either, but if the migration is in > the api level database then you do not need a cell name to get the > migration from the db. The cell name is only used to route a request to a > cell database. > > Thanks very much. Sorry for my question is not clear. But you have gave me the answer.
> >> Thanks, >> John >> >> __________________________________________________________________________ >> OpenStack Development Mailing List (not for usage questions) >> Unsubscribe: >> openstack-dev-requ...@lists.openstack.org?subject:unsubscribe >> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev >> >
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