maria-discuss team mailing list archive

[Thomas <thomas@plant.systems>]

Hello,
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 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?

Server  is a baremetal with battery backed raid10. OS is Centos 7 all 
updated.
Thanks,
Thomas