![]() ![]() I removed id from that query and kept some_identifier_id as the unique key to support the same replace query. Inserting or replacing auto-incremental primary key is the most probable and obvious reason of deadlock in Galera. So it’s quite possible to get deadlock when the replace into query syncing id from db1.table1 to db.table2. Galera Cluster uses at the cluster-level optimistic concurrency control, which can result in transactions that issue a COMMIT aborting at that stage. ![]() Galera uses a mechanism based on autoincrement increment to produce unique non-conflicting sequences, so on every single node the sequence will have gaps. Which helped me to realize the actual problem.ĭo not rely on auto-increment values to be sequential. After some research I found some useful articles known limitations of mariadb galera cluster, Differences from a standalone MySQL server etc. So the only way- checkout any of the documents… whatever is available. But none of these actually solved the problem. LOCK IN SHARE MODE, ordering by id or checking the log SHOW ENGINE INNODB STATUS etc. The above points were enough for me to start some research on how Galera works. Let’s assume in production I have 5 DB servers with multi-master synchronous replication using Galera cluster. Executing the query in any of the individual nodes within cluster leads to failure.All the tables are InnoDB db1.table1 => Collation: latin1_swedish_ci and in db2 both of the tables => Collation: utf8_unicode_ci.The query works fine in development server but fails in production server.The source table has approximately 50k records only. | some_other_identifier_id | varchar(255) | YES | | NULL | | | some_identifier_id | varchar(255) | YES | UNI | NULL | | | some_identifier_id | varchar(255) | YES | MUL | NULL | | | updated_at | datetime | YES | | NULL | | | created_at | datetime | YES | | NULL | | | id | int(11) | NO | PRI | NULL | auto_increment | | Field | Type | Null | Key | Default | Extra | REPLACE INTO db2.table2 (id, some_identifier_id, name, created_at, updated_at) (SELECT id, some_identifier_id, name, created_at, updated_at FROM db1.table1 WHERE some_identifier_id IS NOT NULL AND some_identifier_id NOT IN (SELECT some_identifier_id FROM db2.table1 WHERE some_other_identifier_id IS NOT NULL)) ĮRROR 1213 (40001): Deadlock found when trying to get lock try restarting transaction Though the script was successfully running in development server but in production it was continuously failing for a query with deadlock error. There was a requirement to migrate data from one database to another from one schema to another on a daily basis. $Proxy 20.execute (Unknown Source)Īt. (sqlexecutor.java:81)Īt. (generalstatement.java:200)Īt. (generalstatement.Recently I was working on a data migration script. Cause.MySQLTransactionRollbackException:Deadlock found when trying to get lock Try restarting transactionĪt .anslate ( SQLERRORCODESQLEXCEPTIONTRANSLATOR.JAVA:300)Īt .SqlMapClientTemplate.execute (sqlmapclienttemplate.java:212)Īt .SqlMapClientTemplate.update (sqlmapclienttemplate.java:411)Īt .BaseDaoImpl.update (basedaoimpl.java:162)Ĭaused by.exception.NestedSQLException:Īt. (generalstatement.java:91)Īt. (sqlmapexecutordelegate.java:505)Īt. (sqlmapsessionimpl.java:90)Īt .sqlmapclienttemplate$10.doinsqlmapclient (sqlmapclienttemplate.java:413)Īt .SqlMapClientTemplate.execute (sqlmapclienttemplate.java:209)Ĭaused By.MySQLTransactionRollbackException:Deadlock found when trying to get lock Try restarting transactionĪt .createSQLException (sqlerror.java:941)Īt .checkErrorPacket (mysqlio.java:2870)Īt .sendCommand (mysqlio.java:1573)Īt .serverExecute (serverpreparedstatement.java:1169)Īt .executeInternal (serverpreparedstatement.java:693)Īt .execute (preparedstatement.java:794)Īt 2. (newproxypreparedstatement.java:989)Īt (Unknown Source)Īt (delegatingmethodaccessorimpl.java:43)Īt .invoke (method.java:606)Īt. (preparedstatementlogproxy.java:62)Īt. Cause.MySQLTransactionRollbackException:Deadlock found when trying to get lock Try restarting transaction Nested exception is .exception.NestedSQLException: Check the point.updatepointaccount-inlineparametermap. The error occurred while applying a parameter map. The subsequent access will cause a deadlock!Ĭaused by::SqlMapClient operation SQL InnoDB is a row-level lock, but the mechanism of MySQL is to use the index to find the row, if your where field is not indexed, then MySQL can not find that line, it will lock the entire table Update table name set XX=XXX where xxx=xxx! Then you can find the statement that caused the deadlock based on this piece of content. This command is executed after the MySQL command line, if there is a deadlock Show engine InnoDB status (varies by MySQL version) Various commands to view the deadlock information, the following can be used: ![]()
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