Hi Glance experts, I'd like to send this mail again, hope I can get help and suggest from glance experts. The question is from a bug https://bugs.launchpad.net/glance/+bug/1462315,
If an image-member is deleted, then create it again with the same parameters, glance searches db to see if there is already an existing one, but the result doesn't include the record which was marked as deleted, glance will try to create a new one with the same parameters, it works well on mysql. But it is failed on DB2 with SQL0803N error. The root cause is that DB2 constraint is more restricted than mysql. For db2, the columns under unique constrains should be "NOT NULL", currently the column "deleted_at" which is one of unique constrain of image_members is nullable. A possible solution is to alter it to "not null" in migration. that means we have to insert a default timestamp value for the new created image-member, an active member with a no-blank timestamp for "deleted_at" seems very confusing. Another fix is: we may check all existing image-member records including the deleted image-member before create image-member, then update it if it exists, otherwise create a new one, that is proposed in https://review.openstack.org/#/c/190895/ I'm wondering why can't we use only one record to maintain the member-ship between a pair of image and tenant. Maybe there is some other consideration, can you help give me some suggestion ? I'd like to know more. Thanks. Best regards, LongQuan
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