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Semi-sync status were not reset by FLUSH STATUS, this was because all semi-sync status variables are defined as SHOW_FUNC and FLUSH STATUS could only reset SHOW_LONG type variables. This problem is fixed by change all status variables that should be reset by FLUSH STATUS from SHOW_FUNC to SHOW_LONG. After the fix, the following status variables will be reset by FLUSH STATUS: Rpl_semi_sync_master_yes_tx Rpl_semi_sync_master_no_tx Note: normally, FLUSH STATUS itself will be written into binlog and be replicated, so after FLUSH STATS, one of Rpl_semi_sync_master_yes_tx Rpl_semi_sync_master_no_tx can be 1 dependent on the semi-sync status. So it's recommended to use FLUSH NO_WRITE_TO_BINLOG STATUS to avoid this.