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This patch changes how old rows in mysql.gtid_slave_pos* tables are deleted. Instead of doing it as part of every replicated transaction in record_gtid(), it is done periodically (every @@gtid_cleanup_batch_size transaction) in the slave background thread. This removes the deletion step from the replication process in SQL or worker threads, which could speed up replication with many small transactions. It also decreases contention on the global mutex LOCK_slave_state. And it simplifies the logic, eg. when a replicated transaction fails after having deleted old rows. With this patch, the deletion of old GTID rows happens asynchroneously and slightly non-deterministic. Thus the number of old rows in mysql.gtid_slave_pos can temporarily exceed @@gtid_cleanup_batch_size. But all old rows will be deleted eventually after sufficiently many new GTIDs have been replicated. |
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