[openstack-dev] [Neutron][stable] How to backport database schema fixes

2014-08-29 Thread Yaguang Tang
Hi, all It seems that currently it's hard to backport any database schema fix to Neutron [1] which uses alembic to manage db schema version. Nova has the same issue before and a workaround is to put some placeholder files before each release. So first do we allow db schema fixes to be backport to

Re: [openstack-dev] [Neutron][stable] How to backport database schema fixes

2014-08-29 Thread Salvatore Orlando
If you are running version from a stable branch, changes in DB migrations should generally be forbidden as the policy states since those migrations are not likely to be executed again. Downgrading and then upgrading again is extremely risky and I don't think anybody would ever do that. However,

Re: [openstack-dev] [Neutron][stable] How to backport database schema fixes

2014-08-29 Thread Russell Bryant
On 08/29/2014 06:54 AM, Salvatore Orlando wrote: If you are running version from a stable branch, changes in DB migrations should generally be forbidden as the policy states since those migrations are not likely to be executed again. Downgrading and then upgrading again is extremely risky and