Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in binary log index file' Series 2: reset slave

Reset slave clears all slave Database Replication information.
General application scenarios: for example, switching to different masters, master-slave Redo, etc;
1. Run the command on the slave. You must stop the slave before execution.
2. after reset slave is executed, all replication-related information, including master.info, relay-log.info, and unconditional deletion of all relay logs are cleared ). note that it is unconditional, that is, it does not manage whether your slave SQL thread has replayed all the relay logs.
3. Note: after stopping slave, save the show slave status information and then execute reset slave. This information will be useful in general.

Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in binary log index file' Series 2: reset slave