A slave failed the replication of a query and stopped working. I performed a fresh database dump on the master mysql server with --databases myapp
to only include the one database that is supposed to be replicated. This is because on the slave I have other apps databases running that should be isolated from replication.
The latest command i tried is mysqldump --databases myapp --flush-privileges --single-transaction --flush-logs --triggers --routines --events > dump.sql
After the database has been freshly imported and the slave is reset and started once again, it continuously fails every 1-20th transaction due to inconsistencies. Deletes/Updates fail.
Some of the error messages are:
Could not execute Write_rows event on table myapp.table; Duplicate entry '378483-1195430' for key 'unique', Error_code: 1062; handler error HA_ERR_FOUND_DUPP_KEY; the event's master log mysql-bin.096490, end_log_pos 82577698
Could not execute Update_rows event on table myapp.table; Can't find record in 'table', Error_code: 1032; handler error HA_ERR_KEY_NOT_FOUND; the event's master log mysql-bin.096136, end_log_pos 648509
Even when purging mysql and reinstalling mysql, the problem persists. Only on a freshly setup vm, it seems to accept the database dump.
My feeling is that there is some residue from the previous replication that interferes. I tried to run mysqldump with different combinations of arguments, none help so far. I also flushed the mysql.gtid_executed table manually, but the problem does not go away.
Which steps do i have to undertake to reset the mysql instance into a neutral state where i can restart the gtid slave replication?
The OS is ubuntu 18.04, mysql version is 5.7 on both master and slave.
The answer was, that GLOBAL.gtid_purged and GLOBAL.gtid_executed dont reset unless you also execute reset master;
which is a bit counterintuitive on a mysql instance that is only a slave, but that empties those two global variables and if the mysqldump is made with --set-gtid-purged=on
, it sets the correct values too.
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