Public bug reported:
If the first trait you try to retrieve from placement doesn't exist,
traits are not synced from os_traits into the database, so it winds up
empty.
try:
rp_obj.Trait.get_by_name(self.ctx, 'CUSTOM_GOLD')
except exception.TraitNotFound:
pass
rp_obj.Trait.get_by_name(self.ctx, os_traits.HW_CPU_X86_AVX2) # <==
raises TraitNotFound
I *think* what's happening is this:
1 @staticmethod
2 @db_api.api_context_manager.writer # trait sync can cause a write
3 def _get_by_name_from_db(context, name):
4 _ensure_trait_sync(context)
5 result = context.session.query(models.Trait).filter_by(
6 name=name).first()
7 if not result:
8 raise exception.TraitNotFound(names=name)
9 return result
Line 4 "succeeds" and sets _TRAITS_SYNCED = True.
But because line 8 raises, the transaction is rolled back. Database stays
empty.
Subsequent retrieval attempts see _TRAITS_SYNCED == True so don't try to resync.
** Affects: nova
Importance: Undecided
Status: New
** Tags: placement
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https://bugs.launchpad.net/bugs/1760322
Title:
Traits not synced if first retrieval fails
Status in OpenStack Compute (nova):
New
Bug description:
If the first trait you try to retrieve from placement doesn't exist,
traits are not synced from os_traits into the database, so it winds up
empty.
try:
rp_obj.Trait.get_by_name(self.ctx, 'CUSTOM_GOLD')
except exception.TraitNotFound:
pass
rp_obj.Trait.get_by_name(self.ctx, os_traits.HW_CPU_X86_AVX2) # <==
raises TraitNotFound
I *think* what's happening is this:
1 @staticmethod
2 @db_api.api_context_manager.writer # trait sync can cause a write
3 def _get_by_name_from_db(context, name):
4 _ensure_trait_sync(context)
5 result = context.session.query(models.Trait).filter_by(
6 name=name).first()
7 if not result:
8 raise exception.TraitNotFound(names=name)
9 return result
Line 4 "succeeds" and sets _TRAITS_SYNCED = True.
But because line 8 raises, the transaction is rolled back. Database stays
empty.
Subsequent retrieval attempts see _TRAITS_SYNCED == True so don't try to
resync.
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https://bugs.launchpad.net/nova/+bug/1760322/+subscriptions
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