Description:
To fix bug #60926 new variable, --slave-max-allowed-packet, were introduced, but its size is limited to 1G. In this way if master created row event, larger than 1G, slave will fail.
How to repeat:
Start master and slave with max-allowed-packet=1G and slave-max-allowed-packet=1G (maximum)
On master:
set binlog_format='row';
create table t1(f1 longtext);
insert into t1 values(repeat('a', 1073741824/4));
create table t2 like t1;
flush logs;
insert into t2 select concat(f1,f1,f1,f1) from t1;
Ensure data inserted properly into t2:
mysql> select count(*) from t2;
+----------+
| count(*) |
+----------+
| 1 |
+----------+
1 row in set (0.00 sec)
On slave:
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 127.0.0.1
Master_User: root
Master_Port: 13000
Connect_Retry: 1
Master_Log_File: master-bin.000002
Read_Master_Log_Pos: 337
Relay_Log_File: slave-relay-bin.000004
Relay_Log_Pos: 369
Relay_Master_Log_File: master-bin.000002
Slave_IO_Running: No
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 154
Relay_Log_Space: 807
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 1236
Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'log event entry exceeded max_allowed_packet; Increase max_allowed_packet on master; the first event '' at 4, the last event read from './master-bin.000002' at 337, the last byte read from './master-bin.000002' at 356.'
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_UUID: 4e4741d5-316d-11e5-9104-1caff70598d3
Master_Info_File: /home/sveta/build/mysql-5.7/mysql-test/var/mysqld.2/data/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 10
Master_Bind:
Last_IO_Error_Timestamp: 150723 22:11:35
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
1 row in set (0.01 sec)
mysql> select count(*) from t2;
+----------+
| count(*) |
+----------+
| 0 |
+----------+
1 row in set (0.00 sec)
Events less than 1G replicated successfully:
mysql> select count(*) from t1;
+----------+
| count(*) |
+----------+
| 1 |
+----------+
1 row in set (0.00 sec)
Suggested fix:
Make slave ignore max-allowed-packet value completely, because with ROW format is easy to create such big events (I saw 18G event!).
