Thomas <thomas@plant.systems> writes:
Hello,
Howdy, Tomas.
we have upgraded our MySQL Master/Slave server vom 10.1.24 to 10.1.48
on 25.01. Backups worked as usual, but since friday (29.01.) our
backups do not work anymore. I have seen that entering a 'stop slave;'
on mysql cli hangs forever, while in the background (on a second
console, I see the replication going on, but the gtid is far away from
the master. According to MaxScale, on the slave it is '0-1-8696229561
So select @@global.gtid_slave_pos = 0-1-8696229561 remains all the time
since
2021-02-01 8:45:40 140290041063168 [Note] Slave SQL thread
initialized, starting replication in log 'mysql-bin.005586' at
position 1073742303, relay log '/var/lib/mysql/relay-bin.000001'
position: 4; GTID position '0-1-8696229561'
(paste from a followup mail)?
And the same to Exec_Master_Log_Pos: 967647646 that also has not moved?
As you mention backup, could it have been running to block slave
thread(s)..
Could you please make few selects:
#--connection slave
show processlist;
show slave status;
select @@global.gtid_slave_pos;
select @@global.slave_parallel_threads;
select @@global.slave_parallel_mode;
It may be interesting to see what are events starting from
mysql-bin.005587:967647646 unless it gets clear from show-processist
results.
I'll try to help.
Cheers,
Andrei
and on the master '0-1-8705275411' and not moving forward on the
slave.
Slave 'show slave status':
MariaDB [(none)]> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 172.16.1.1
Master_User: replication_user
Master_Port: 3306
Connect_Retry: 10
Master_Log_File: mysql-bin.005595
Read_Master_Log_Pos: 581894706
Relay_Log_File: relay-bin.000002
Relay_Log_Pos: 693
Relay_Master_Log_File: mysql-bin.005587
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: 967647646
Relay_Log_Space: 8205026277
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: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_SSL_Crl:
Master_SSL_Crlpath:
Using_Gtid: Slave_Pos
Gtid_IO_Pos: 0-1-8705427292
Replicate_Do_Domain_Ids:
Replicate_Ignore_Domain_Ids:
Parallel_Mode: optimistic
1 row in set (0.00 sec)
Master status is this:
MariaDB [(none)]> show master status\G
*************************** 1. row ***************************
File: mysql-bin.005595
Position: 581594839
Binlog_Do_DB:
Binlog_Ignore_DB:
1 row in set (0.01 sec)
If I try to stop the server it hangs also. Waited half an hour after I
saw the backups hanging on the 'stop slave' command, then killed the
server with kill -9. It restarted without complaining, but the hang is
still occuring when doing a 'stop slave'.
Can anybody help me diagnosing and possibly resolving this issue?
