Percona Server’s “crash-resistant replication” feature is useful in versions 5.1 through 5.5. However, in Percona Server 5.6 it’s replaced with Oracle MySQL 5.6′s “crash safe replication” feature, which has it’s own implementation (you can read more about it here).
A MySQL slave normally stores its position in files master.info and relay-log.info which are updated by slave IO_THREAD & slave SQL_THREAD respectively. The file master.info contains connection info & replication coordinates showing how many events were fetched from the master binary log. The relay-log.info, on the other hand, represents info showing the positions where the slave applied those events. You can read more about slave status logs …[Read more]