We have a master - slave setup with ROW based replication. We are seeing huge delay's on the salve even though there is no activity running wither on master or slave.
When we looked in, we observed the SQL thread looks like hanged. It has been in "Reading event from the relay log" state since last 3 hours or more.
baleaf:(none)> show processlist ;
+--------+-------------+-----------+------+---------+-------+----------------------------------+----- -------------+
| Id | User | Host | db | Command | Time | State | Info |
+--------+-------------+-----------+------+---------+-------+----------------------------------+----- -------------+
| 217159 | system user | | NULL | Connect | 1039 | Waiting for master to send event | NULL |
| 217160 | system user | | NULL | Connect | 10045 | Reading event from the relay log | NULL |
+--------+-------------+-----------+------+---------+-------+----------------------------------+----- -------------+
4 rows in set (0.00 sec)
baleaf:blackarrow_dw> SHOW SLAVE STATUS \G
*************************** 1. row ***************************
Slave_IO_State: Queueing master event to the relay log
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: binlog.001403
Read_Master_Log_Pos: 95601911
Relay_Log_File: relay-bin.000002
Relay_Log_Pos: 12757514
Relay_Master_Log_File: binlog.001403
Slave_IO_Running: Yes
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: 32820355
Relay_Log_Space: 75539220
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: 7720
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
1 row in set (0.00 sec)
Shall some one please have a look into this ASAP.