What is the function of relay_log_info_repository and sync_relay_log_info in MySQL

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Realy_log_info_repository is used to determine where the location information for slave synchronization is recorded, and there are also two parameters. If relay_log_info_repository=file, a realy-log.info is created, and if relay_log_info_repository=table, a mysql.slave_relay_info table is created to record the synchronized location information.

The sync_relay_log_info parameter is used to control the refresh mode of the slave synchronization location, which is affected by the relay_log_info_repository parameter.

1) relay_log_info_repository=file,sync_relay_log_info=N, if N > 0, synchronize realy_info.info files to disk using the fdatasync () method after N transactions. If Number0, then Mysql does not synchronize realy_log.info files to disk, but lets the operating system decide.

2) relay_log_info_repository=table, if the table is a transaction-enabled table, slave updates the table after each transaction, ignoring the sync_relay_log_info parameter. If the table is a non-transactional table, sync_log_info=N, when N > 0, slave updates the table after every N event, and when Number0, the table is never updated.

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