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Updated the query to improve the performance.

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The scheduled job for deleting emails has failed silently for many nights now.
This commit is contained in:
Rebecca Law
2018-12-20 16:09:38 +00:00
parent 7d026ad385
commit 89923eab71
1 changed files with 30 additions and 12 deletions
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36
app/dao/notifications_dao.py
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@@ -44,7 +44,8 @@ from app.models import (
NOTIFICATION_SENT, NOTIFICATION_SENT,
SMS_TYPE, SMS_TYPE,
EMAIL_TYPE, EMAIL_TYPE,
ServiceDataRetention ServiceDataRetention,
Service
) )
from app.utils import get_london_midnight_in_utc from app.utils import get_london_midnight_in_utc
from app.utils import midnight_n_days_ago, escape_special_characters from app.utils import midnight_n_days_ago, escape_special_characters
@@ -315,8 +316,9 @@ def _filter_query(query, filter_dict=None):
@statsd(namespace="dao") @statsd(namespace="dao")
def delete_notifications_created_more_than_a_week_ago_by_type(notification_type): def delete_notifications_created_more_than_a_week_ago_by_type(notification_type, qry_limit=10000):
current_app.logger.info('Deleting {} notifications for services with flexible data retention'.format(notification_type)) current_app.logger.info(
'Deleting {} notifications for services with flexible data retention'.format(notification_type))
flexible_data_retention = ServiceDataRetention.query.filter( flexible_data_retention = ServiceDataRetention.query.filter(
ServiceDataRetention.notification_type == notification_type ServiceDataRetention.notification_type == notification_type
@@ -332,17 +334,33 @@ def delete_notifications_created_more_than_a_week_ago_by_type(notification_type)
deleted += query.delete(synchronize_session='fetch') deleted += query.delete(synchronize_session='fetch')
db.session.commit() db.session.commit()
current_app.logger.info('Deleting {} notifications for services without flexible data retention'.format(notification_type)) current_app.logger.info(
'Deleting {} notifications for services without flexible data retention'.format(notification_type))
seven_days_ago = convert_utc_to_bst(datetime.utcnow()).date() - timedelta(days=7) seven_days_ago = convert_utc_to_bst(datetime.utcnow()).date() - timedelta(days=7)
services_with_data_retention = [x.service_id for x in flexible_data_retention] services_with_data_retention = [x.service_id for x in flexible_data_retention]
query = db.session.query(Notification).filter(func.date(Notification.created_at) < seven_days_ago, service_ids_to_purge = db.session.query(Service.id).filter(Service.id.notin_(services_with_data_retention)).all()
for service_id in service_ids_to_purge:
subquery = db.session.query(
Notification
).filter(
Notification.notification_type == notification_type, Notification.notification_type == notification_type,
Notification.service_id.notin_( func.date(Notification.created_at) < seven_days_ago,
services_with_data_retention)) Notification.service_id == service_id
).limit(qry_limit)
if notification_type == LETTER_TYPE: if notification_type == LETTER_TYPE:
_delete_letters_from_s3(query=query) _delete_letters_from_s3(query=subquery)
deleted += query.delete(synchronize_session='fetch')
number_deleted = db.session.query(Notification).filter(
Notification.id.in_([x.id for x in subquery.all()])).delete(synchronize_session='fetch')
deleted += number_deleted
db.session.commit()
while number_deleted > 0:
number_deleted = db.session.query(Notification).filter(
Notification.id.in_([x.id for x in subquery.all()])).delete(synchronize_session='fetch')
deleted += number_deleted
db.session.commit() db.session.commit()
current_app.logger.info('Finished deleting {} notifications'.format(notification_type)) current_app.logger.info('Finished deleting {} notifications'.format(notification_type))