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Final push for WL#1098:
"Add a column "Timestamp_of_last_master_event_executed" in SHOW SLAVE STATUS". Finally this is adding - Slave_IO_State (a copy of the State column of SHOW PROCESSLIST for the I/O thread, so that the users, most of the time, has enough info with only SHOW SLAVE STATUS). - Seconds_behind_master. When the slave connects to the master it does SELECT UNIX_TIMESTAMP() on the master, computes the absolute difference between the master's and the slave's clock. It records the timestamp of the last event executed by the SQL thread, and does a small computation to find the number of seconds by which the slave is late.
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@ -8,8 +8,8 @@ create table t1 (a int primary key);
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insert into t1 values (1),(1);
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ERROR 23000: Duplicate entry '1' for key 1
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show slave status;
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Master_Host Master_User Master_Port Connect_retry Master_Log_File Read_Master_Log_Pos Relay_Log_File Relay_Log_Pos Relay_Master_Log_File Slave_IO_Running Slave_SQL_Running Replicate_do_db Replicate_ignore_db Replicate_do_table Replicate_ignore_table Replicate_wild_do_table Replicate_wild_ignore_table Last_errno Last_error Skip_counter Exec_master_log_pos Relay_log_space Until_condition Until_Log_File Until_Log_pos Master_SSL_Allowed Master_SSL_CA_File Master_SSL_CA_Path Master_SSL_Cert Master_SSL_Cipher Master_SSL_Key
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127.0.0.1 root MASTER_PORT 1 master-bin.000001 213 slave-relay-bin.000002 257 master-bin.000001 Yes Yes test.t1 0 0 213 257 None 0 No
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Slave_IO_State Master_Host Master_User Master_Port Connect_retry Master_Log_File Read_Master_Log_Pos Relay_Log_File Relay_Log_Pos Relay_Master_Log_File Slave_IO_Running Slave_SQL_Running Replicate_do_db Replicate_ignore_db Replicate_do_table Replicate_ignore_table Replicate_wild_do_table Replicate_wild_ignore_table Last_errno Last_error Skip_counter Exec_master_log_pos Relay_log_space Until_condition Until_Log_File Until_Log_pos Master_SSL_Allowed Master_SSL_CA_File Master_SSL_CA_Path Master_SSL_Cert Master_SSL_Cipher Master_SSL_Key Seconds_behind_master
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Waiting for master to send event 127.0.0.1 root MASTER_PORT 1 master-bin.000001 213 slave-relay-bin.000002 257 master-bin.000001 Yes Yes test.t1 0 0 213 257 None 0 No #
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show tables like 't1';
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Tables_in_test (t1)
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drop table t1;
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