Fix hard-delete of instance with soft-deleted referential constraints
When hard-deleting an instance we first delete related records but the code was not taking into account soft-deleted related records which will result in the instance delete failing due to a referential constraint because soft-deleted records are not really deleted when it comes to table constraints. This fixes the issue by simply passing read_deleted='yes' to the related record model query in the hard delete path. The related unit test is updated to cover this scenario and a typo in that same test is also fixed here. Change-Id: I9fc5a9cc40ceffc450c1fde1df7fb36581e9cc94 Closes-Bug: #1830438
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@ -1792,7 +1792,11 @@ def instance_destroy(context, instance_uuid, constraint=None,
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key = 'instance_uuid' if model not in filtered_by_uuid else 'uuid'
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filter_ = {key: instance_uuid}
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if hard_delete:
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model_query(context, model).filter_by(**filter_).delete()
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# We need to read any soft-deleted related records to make sure
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# and clean those up as well otherwise we can fail with ForeignKey
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# constraint errors when hard deleting the instance.
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model_query(context, model, read_deleted='yes').filter_by(
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**filter_).delete()
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else:
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model_query(context, model).filter_by(**filter_).soft_delete()
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@ -3070,13 +3070,27 @@ class InstanceTestCase(test.TestCase, ModelsObjectComparatorMixin):
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bdm_values = {
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'instance_uuid': uuid,
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'device_name': 'fake_device',
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'device_name': '/dev/vda',
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'source_type': 'volume',
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'destination_type': 'volume',
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}
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block_dev = block_device.BlockDeviceDict(bdm_values)
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db.block_device_mapping_create(self.ctxt, block_dev, legacy=False)
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# Crate a second BDM that is soft-deleted to simulate that the
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# volume was detached and the BDM was deleted before the instance
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# was hard destroyed.
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bdm2_values = {
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'instance_uuid': uuid,
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'device_name': '/dev/vdb',
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'source_type': 'volume',
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'destination_type': 'volume',
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}
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block_dev2 = block_device.BlockDeviceDict(bdm2_values)
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bdm2 = db.block_device_mapping_create(
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self.ctxt, block_dev2, legacy=False)
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db.block_device_mapping_destroy(self.ctxt, bdm2.id)
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migration_values = {
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"status": "finished",
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"instance_uuid": uuid,
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@ -3122,7 +3136,7 @@ class InstanceTestCase(test.TestCase, ModelsObjectComparatorMixin):
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self.assertEqual(0, len(instance_faults[uuid]))
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inst_bdms = db.block_device_mapping_get_all_by_instance(ctxt, uuid)
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self.assertEqual(0, len(inst_bdms))
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filters = {"isntance_uuid": uuid}
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filters = {"instance_uuid": uuid}
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inst_migrations = db.migration_get_all_by_filters(ctxt, filters)
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self.assertEqual(0, len(inst_migrations))
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vifs = db.virtual_interface_get_by_instance(ctxt, uuid)
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