Type:
Priority:
Resolution:
Fixed
Affects Version/s:
None
When a galera node is a replica of an upstream cluster it is impossible to enable optimistic replication, because the expected conflicts that stem from this replication mode will cause galera code to immediately abort replication.
2023-05-17 13:57:20 6930586 [Note] WSREP: ha_rollback_trans(6930586) rolled back: Deadlock found when trying to get lock; try restarting transaction; is_real 0
2023-05-17 13:57:20 6930586 [Note] WSREP: ha_rollback_trans(6930586) rolled back: Deadlock found when trying to get lock; try restarting transaction; is_real 1
2023-05-17 13:57:20 6930586 [Note] WSREP: SQL apply failed, res 149 conflict state: aborted
2023-05-17 13:57:20 6930586 [ERROR] Slave SQL: Node has dropped from cluster, Gtid 0-8174-126467367555, Internal MariaDB error code: 1047
relates to
MDEV-10962
Deadlock with 3 concurrent DELETEs by unique key
Closed
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Bug
Critical
It looks that the error returned from optimistic async replication applying conflicts is treated as galera cluster failure. The failure should instead be returned to optimistic replication control, where retrying should be handled. I will prepare a pull request for refactoring this failure handling.