MySQL Backup Server (Slave) Gets Fatal Error 1236 from Master When Reading Binary Log on Oracle Big Data Appliance V2
(Doc ID 1595574.1)
Last updated on OCTOBER 18, 2019
Applies to:Big Data Appliance Integrated Software - Version 2.0.1 to 2.1.2 [Release 2.0 to 2.1]
In the case here the MySQL Backup Server running on Node02 of the cluster reports several conditions which indicate that the MySQL Master Server had crashed and the MySQL Backup Server can not reconnect to the Master. (Note that on Oracle Big Data Appliance (BDA) V2 the MySQL Master Server runs on Node03 of the cluster. The MySQL Backup Server runs on Node02 of the cluster.) Theses symptoms can be viewed in the MySQL output from "show slave status\G":
Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'Client requested master to start replication from impossible position'
Detailed output shows like:
c) Comparing the mysql "show slave status\G" output on the MySQL Slave (Node02) with the mysqlbinlog output on the MySQL Master (Node03) indicates an end position on the Master lower than the position on the Slave. For example:
From the Slave:
From the Master:
#1234565 21:07:02 server id 1 end_log_pos 149701932 Xid = 1212345
From this output we see that the end position on the MySQL Master is 149701932, while the MySQL Slave points to a master log far ahead of this i.e. Read_Master_Log_Pos: 149749150.
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