[openstack-dev] [Nova] question about DB migration difficulty

Mike Spreitzer mspreitz at us.ibm.com
Wed Nov 13 18:18:45 UTC 2013

This is a follow-up to the design summit discussion about DB migrations. 
There was concern about the undo-ability of some migrations.  The specific 
example cited was removal of a column.  Could that be done with the 
following three migrations, each undo-able?  First, change the code to 
keep writing the column but no longer read the column.  Second migration 
changes the code to neither read nor write the column.  Third migration 
physically removes the column.
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