maria-discuss team mailing list archive

[Ljr Yang <dbmsprog@xxxxxxxxx>]

Additional instructions:
Current master 10.1.0.61 ,previous it is a slave and set
rpl_semi_sync_master_enabled = on too.
after switchover, it change to master  and 10.1.0.62 change to slave.
if want to rpl_semi_sync_master_clients show  normal, Is it must restart
10.1.0.61 ?


2017-03-28 18:18 GMT+08:00 Ljr Yang <dbmsprog@xxxxxxxxx>:

> Thank you reply.
> 1) it have not "Starting semi-sync replication" in master's error log
>
> 2) slave1 : 10.1.0.62 (serverid = 62),  slave2 : 10.1.0.63 (serverid = 63)
>
>  on two slaves,  all set rpl_semi_sync_master_enabled = on and
> log_slave_updates=on,
> but after  modify /etc/my.cnf , add  rpl_semi_sync_master_enabled = off
> and restart mariadb.
>
> after restart slave1 10.1.0.62 ,  master error log:
> 2017-03-28 18:03:05 140466955438848 [ERROR] Read semi-sync reply network
> error:  (errno: 1158)
> 2017-03-28 18:03:05 140466955438848 [Note] Stop semi-sync binlog_dump to
> slave (server_id: 62)
> 2017-03-28 18:03:59 140469134961408 [Note] Start semi-sync binlog_dump to
> slave (server_id: 62), pos(mysql-bin.021937, 4)
>
> after restart slave2 10.1.0.63 ,  master error log:
> 2017-03-28 18:07:07 140469136173824 [ERROR] Read semi-sync reply network
> error:  (errno: 1158)
> 2017-03-28 18:07:07 140469136173824 [Note] Stop semi-sync binlog_dump to
> slave (server_id: 63)
> 2017-03-28 18:09:14 140467881470720 [Note] Start semi-sync binlog_dump to
> slave (server_id: 63), pos(mysql-bin.021937, 4)
>
> on master:  SHOW GLOBAL STATUS LIKE '%semi%' ;
> *Rpl_semi_sync_master_clients 1*
>
> 2017-03-28 7:36 GMT+08:00 Pavel Ivanov <pivanof@xxxxxxxxxx>:
>
>> Could it be that your slaves are periodically disconnecting from the
>> master and then reconnecting again, and you just happened to catch a
>> state when only one slave is connected when you queried for
>> Rpl_semi_sync_master_clients status? To confirm or deny this you
>> should look at the master's error log to see if there are periodically
>> repeating messages "Starting semi-sync replication".
>>
>> Regarding your config: your email suggests that you have
>> rpl_semi_sync_master_enabled set to ON on slaves. Is that really true?
>> Such setting on the slaves will probably work only if
>> log_slave_updates is set to OFF. Is it set to OFF on your slaves? If
>> not then you should set rpl_semi_sync_master_enabled to OFF on the
>> slaves to not make them wait for their slaves (which don't exist) to
>> ack the commits.
>>
>> On Fri, Mar 24, 2017 at 3:02 AM, Ljr Yang <dbmsprog@xxxxxxxxx> wrote:
>> >  HI,
>> >     we have many groups master slave , used semi-sync are normal.
>> >     but there a group master and slave , semi-sync status show have a
>> little
>> > question.
>> >
>> >    master: 10.1.0.61    (MariaDB 10.1.22)
>> >    slave1 : 10.1.0.62    (MariaDB 10.1.22)
>> >    slave2:  10.1.0.63    (MariaDB 10.1.22)
>> >
>> > three machine's semi-sync parameter:
>> > rpl_semi_sync_master_enabled ON
>> > rpl_semi_sync_master_timeout 10000
>> > rpl_semi_sync_master_wait_point AFTER_COMMIT
>> > rpl_semi_sync_slave_enabled ON
>> >
>> >
>> > on master:  SHOW GLOBAL STATUS LIKE '%semi%' ;
>> > Rpl_semi_sync_master_clients 1   #  should show : 2
>> >  ......
>> >
>> > on slave1:   stop slave io_thread;
>> >  then on master: SHOW GLOBAL STATUS LIKE '%semi%' ;
>> > Rpl_semi_sync_master_clients ０
>> >
>> > on slave1:   start slave io_thread;
>> > on master:  SHOW GLOBAL STATUS LIKE '%semi%' ;
>> > Rpl_semi_sync_master_clients 1
>> >
>> >
>> > on slave2:   stop slave io_thread;
>> >  then on master: SHOW GLOBAL STATUS LIKE '%semi%' ;
>> > Rpl_semi_sync_master_clients ０
>> >
>> > on slave2:   start slave io_thread;
>> > on master:  SHOW GLOBAL STATUS LIKE '%semi%' ;
>> > Rpl_semi_sync_master_clients 1
>> >
>> >
>> > on slave1 and slave2 , I had uninstall and reinstall semi-sync plugin,
>> > still show  Rpl_semi_sync_master_clients is 1
>> >
>> > I don't know where config have question? please you help, thanks
>> >
>> >
>> >
>> > _______________________________________________
>> > Mailing list: https://launchpad.net/~maria-discuss
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>> >
>>
>
>
>
> --
> Ljr
>



-- 
Ljr