How to Report Replication Bugs or Problems 4. Use  mysqlbinlog  to examine the binary logs. The following should be helpful to find the problem statement.  log_file  and  log_pos  are the  Master_Log_File  and  Read_Master_Log_Pos  values from  SHOW REPLICA | SLAVE STATUS . 3. Save all evidence before resetting the replication state. If we have no information or only sketchy information, it becomes difficult or impossible for us to track down the problem. The evidence you should collect is: •All binary log files from the source •All binary log files from the replica •The output of  SHOW MASTER STATUS  from the source at the time you discovered the problem •The output of  SHOW REPLICA | SLAVE STATUS  from the replica at the time you discovered the problem •Error logs from the source and the replica After you have collected the evidence for the problem, try to isolate it as a separate test case first. Then enter the problem with as much information as possible into our bugs database using the instructions at Section 1.6, “How to Report Bugs or Problems” . shell>  mysqlbinlog --start-position= log_pos log_file  | head