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501cce2b33
Report claims that Seconds_behind_master behaves unexpectedly. Code analysis shows that there is an evident flaw in that treating of FormatDescription event is wrong so that after FLUSH LOGS on slave the Seconds_behind_master's calculation slips and incorrect value can be reported to SHOW SLAVE STATUS. Even worse is that the gap between the correct and incorrect deltas grows with time. Fixed with prohibiting changes to rpl->last_master_timestamp by artifical events (any kind of). suggestion as comments is added how to fight with lack of info on the slave side by means of new heartbeat feature coming. The test can not be done ealily fully determistic.
122 lines
2.7 KiB
Plaintext
122 lines
2.7 KiB
Plaintext
stop slave;
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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
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reset master;
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reset slave;
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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
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start slave;
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show slave status /* Second_behind reports 0 */;;
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Slave_IO_State #
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Master_Host 127.0.0.1
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Master_User root
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Master_Port 9306
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Connect_Retry 1
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Master_Log_File master-bin.000001
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Read_Master_Log_Pos 98
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Relay_Log_File #
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Relay_Log_Pos #
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Relay_Master_Log_File master-bin.000001
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Slave_IO_Running Yes
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Slave_SQL_Running Yes
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Replicate_Do_DB
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Replicate_Ignore_DB
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Replicate_Do_Table
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Replicate_Ignore_Table
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Replicate_Wild_Do_Table
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Replicate_Wild_Ignore_Table
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Last_Errno 0
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Last_Error
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Skip_Counter 0
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Exec_Master_Log_Pos 98
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Relay_Log_Space #
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Until_Condition None
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Until_Log_File
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Until_Log_Pos 0
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Master_SSL_Allowed No
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Master_SSL_CA_File
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Master_SSL_CA_Path
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Master_SSL_Cert
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Master_SSL_Cipher
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Master_SSL_Key
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Seconds_Behind_Master 0
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drop table if exists t1;
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Warnings:
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Note 1051 Unknown table 't1'
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create table t1 (f1 int);
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flush logs /* contaminate rli->last_master_timestamp */;
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lock table t1 write;
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insert into t1 values (1);
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show slave status /* bug emulated: reports slave threads starting time about 3*3 not 3 secs */;;
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Slave_IO_State #
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Master_Host 127.0.0.1
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Master_User root
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Master_Port 9306
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Connect_Retry 1
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Master_Log_File master-bin.000001
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Read_Master_Log_Pos 359
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Relay_Log_File #
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Relay_Log_Pos #
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Relay_Master_Log_File master-bin.000001
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Slave_IO_Running Yes
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Slave_SQL_Running Yes
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Replicate_Do_DB
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Replicate_Ignore_DB
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Replicate_Do_Table
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Replicate_Ignore_Table
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Replicate_Wild_Do_Table
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Replicate_Wild_Ignore_Table
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Last_Errno 0
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Last_Error
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Skip_Counter 0
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Exec_Master_Log_Pos 271
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Relay_Log_Space #
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Until_Condition None
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Until_Log_File
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Until_Log_Pos 0
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Master_SSL_Allowed No
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Master_SSL_CA_File
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Master_SSL_CA_Path
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Master_SSL_Cert
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Master_SSL_Cipher
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Master_SSL_Key
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Seconds_Behind_Master 10
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unlock tables;
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flush logs /* this time rli->last_master_timestamp is not affected */;
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lock table t1 write;
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insert into t1 values (2);
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show slave status /* reports the correct diff with master query time about 3+3 secs */;;
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Slave_IO_State #
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Master_Host 127.0.0.1
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Master_User root
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Master_Port 9306
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Connect_Retry 1
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Master_Log_File master-bin.000001
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Read_Master_Log_Pos 447
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Relay_Log_File #
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Relay_Log_Pos #
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Relay_Master_Log_File master-bin.000001
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Slave_IO_Running Yes
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Slave_SQL_Running Yes
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Replicate_Do_DB
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Replicate_Ignore_DB
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Replicate_Do_Table
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Replicate_Ignore_Table
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Replicate_Wild_Do_Table
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Replicate_Wild_Ignore_Table
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Last_Errno 0
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Last_Error
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Skip_Counter 0
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Exec_Master_Log_Pos 359
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Relay_Log_Space #
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Until_Condition None
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Until_Log_File
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Until_Log_Pos 0
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Master_SSL_Allowed No
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Master_SSL_CA_File
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Master_SSL_CA_Path
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Master_SSL_Cert
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Master_SSL_Cipher
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Master_SSL_Key
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Seconds_Behind_Master 6
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unlock tables;
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drop table t1;
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