openstack/ironic
Code Issues Proposed changes

Merge "Fix race condition in backfill_version_column()"

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Jenkins 2017-09-07 17:19:12 +00:00 committed by Gerrit Code Review
commit 3f8ddff37f
2 changed files with 19 additions and 5 deletions
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17
ironic/db/sqlalchemy/api.py
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@ -1218,11 +1218,18 @@ class Connection(api.Connection):
ids = []
for obj in query.slice(0, max_to_migrate):
ids.append(obj['id'])
query = model_query(model).filter(model.id.in_(ids))
num_migrated = query.update(
{model.version: mapping[model.__name__][0]},
synchronize_session=False)
num_migrated = (
model_query(model).
filter(sql.and_(model.id.in_(ids),
model.version.is_(None))).
update({model.version: mapping[model.__name__][0]},
synchronize_session=False))
else:
num_migrated = (
model_query(model).
filter(model.version.is_(None)).
update({model.version: mapping[model.__name__][0]},
synchronize_session=False))
total_migrated += num_migrated
max_to_migrate -= num_migrated

7
releasenotes/notes/backfill_version_column_db_race_condition-713fa05832b93ca5.yaml Normal file
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@ -0,0 +1,7 @@
---
fixes:
- |
Fixes an issue when running ``ironic-dbsync online_data_migrations``. The
value of an object's new ``version`` column might have been incorrectly
changed from a newer object version to an older object version, due to a
race condition. This is no longer the case.