** Changed in: nova
Status: Fix Committed => Fix Released
** Changed in: nova
Milestone: None => juno-1
--
You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1308715
Title:
Deadlock on quota_usages
Status in OpenStack Compute (Nova):
Fix Released
Status in OpenStack Compute (nova) icehouse series:
Fix Released
Bug description:
We are getting deadlocks for concurrent quota reservations that we did
not see in grizzly:
see https://bugs.launchpad.net/nova/+bug/1283987
The deadlock handling needs to be fixed as per above, but we shouldn't
be deadlocking, here. It seems this is due to bad indexes in the
database:
mysql> show index from quota_usages;
+--------------+------------+---------------------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table | Non_unique | Key_name | Seq_in_index
| Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type
| Comment | Index_comment |
+--------------+------------+---------------------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| quota_usages | 0 | PRIMARY | 1
| id | A | 8 | NULL | NULL | | BTREE
| | |
| quota_usages | 1 | ix_quota_usages_project_id | 1
| project_id | A | 8 | NULL | NULL | YES | BTREE
| | |
| quota_usages | 1 | ix_quota_usages_user_id_deleted | 1
| user_id | A | 8 | NULL | NULL | YES | BTREE
| | |
| quota_usages | 1 | ix_quota_usages_user_id_deleted | 2
| deleted | A | 8 | NULL | NULL | YES | BTREE
| | |
+--------------+------------+---------------------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
4 rows in set (0.01 sec)
mysql> explain select * from quota_usages where project_id='foo' and
user_id='bar' and deleted=0;
+----+-------------+--------------+------+------------------------------------------------------------+----------------------------+---------+-------+------+------------------------------------+
| id | select_type | table | type | possible_keys
| key | key_len | ref | rows |
Extra |
+----+-------------+--------------+------+------------------------------------------------------------+----------------------------+---------+-------+------+------------------------------------+
| 1 | SIMPLE | quota_usages | ref |
ix_quota_usages_project_id,ix_quota_usages_user_id_deleted |
ix_quota_usages_project_id | 768 | const | 1 | Using index condition;
Using where |
+----+-------------+--------------+------+------------------------------------------------------------+----------------------------+---------+-------+------+------------------------------------+
1 row in set (0.00 sec)
We should have an index on project_id/deleted and
project_id/user_id/deleted instead of the current values.
To manage notifications about this bug go to:
https://bugs.launchpad.net/nova/+bug/1308715/+subscriptions
--
Mailing list: https://launchpad.net/~yahoo-eng-team
Post to : [email protected]
Unsubscribe : https://launchpad.net/~yahoo-eng-team
More help : https://help.launchpad.net/ListHelp
