openstack/placement
Code Issues Proposed changes

Use one query instead of two for quota_usages

Browse Source 
The second query was unnecessary and not using a proper index. It
seemed to be contributing to a deadlock issue as well.

Change-Id: I1031451b25140d71380c8149d3c83827eec0d4a9
Closes-Bug: #1308715
Co-Authored-by: Chris Behrens <cbehrens@codestud.com>
This commit is contained in:
Vishvananda Ishaya
2014-04-16 13:41:17 -07:00
parent 5fdb096dee
commit 591d3d080e
1 changed files with 20 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
nova/db/sqlalchemy/api.py
View File

@@ -3030,38 +3030,26 @@ def _reservation_create(context, uuid, usage, project_id, user_id, resource,
# code always acquires the lock on quota_usages before acquiring the lock
# on reservations.
def _get_user_quota_usages(context, session, project_id, user_id):
# Broken out for testability
rows = model_query(context, models.QuotaUsage,
read_deleted="no",
session=session).\
filter_by(project_id=project_id).\
filter(or_(models.QuotaUsage.user_id == user_id,
models.QuotaUsage.user_id == None)).\
with_lockmode('update').\
all()
return dict((row.resource, row) for row in rows)
def _get_project_quota_usages(context, session, project_id):
def _get_project_user_quota_usages(context, session, project_id,
user_id):
rows = model_query(context, models.QuotaUsage,
read_deleted="no",
session=session).\
filter_by(project_id=project_id).\
with_lockmode('update').\
all()
result = dict()
proj_result = dict()
user_result = dict()
# Get the total count of in_use,reserved
for row in rows:
if row.resource in result:
result[row.resource]['in_use'] += row.in_use
result[row.resource]['reserved'] += row.reserved
result[row.resource]['total'] += (row.in_use + row.reserved)
else:
result[row.resource] = dict(in_use=row.in_use,
reserved=row.reserved,
total=row.in_use + row.reserved)
return result
proj_result.setdefault(row.resource,
dict(in_use=0, reserved=0, total=0))
proj_result[row.resource]['in_use'] += row.in_use
proj_result[row.resource]['reserved'] += row.reserved
proj_result[row.resource]['total'] += (row.in_use + row.reserved)
if row.user_id is None or row.user_id == user_id:
user_result[row.resource] = row
return proj_result, user_result
@require_context
@@ -3079,10 +3067,8 @@ def quota_reserve(context, resources, project_quotas, user_quotas, deltas,
user_id = context.user_id
# Get the current usages
user_usages = _get_user_quota_usages(context, session,
project_id, user_id)
project_usages = _get_project_quota_usages(context, session,
project_id)
project_usages, user_usages = _get_project_user_quota_usages(
context, session, project_id, user_id)
# Handle usage refresh
work = set(deltas.keys())
@@ -3291,11 +3277,12 @@ def _quota_reservations_query(session, context, reservations):
def reservation_commit(context, reservations, project_id=None, user_id=None):
session = get_session()
with session.begin():
usages = _get_user_quota_usages(context, session, project_id, user_id)
_project_usages, user_usages = _get_project_user_quota_usages(
context, session, project_id, user_id)
reservation_query = _quota_reservations_query(session, context,
reservations)
for reservation in reservation_query.all():
usage = usages[reservation.resource]
usage = user_usages[reservation.resource]
if reservation.delta >= 0:
usage.reserved -= reservation.delta
usage.in_use += reservation.delta
@@ -3307,11 +3294,12 @@ def reservation_commit(context, reservations, project_id=None, user_id=None):
def reservation_rollback(context, reservations, project_id=None, user_id=None):
session = get_session()
with session.begin():
usages = _get_user_quota_usages(context, session, project_id, user_id)
_project_usages, user_usages = _get_project_user_quota_usages(
context, session, project_id, user_id)
reservation_query = _quota_reservations_query(session, context,
reservations)
for reservation in reservation_query.all():
usage = usages[reservation.resource]
usage = user_usages[reservation.resource]
if reservation.delta >= 0:
usage.reserved -= reservation.delta
reservation_query.soft_delete(synchronize_session=False)