Details
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Bug
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Status: Closed (View Workflow)
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Critical
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Resolution: Fixed
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23.02.2
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None
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MXS-SPRINT-187, MXS-SPRINT-188
Description
The binlogrouter will eventually stop replicating with an error that has no error message. This only happens if semi-sync replication is not configured for the server from which the binlogrouter is replicating from. This happens due to CONC-659 where the connector always assumes that the two bytes of semi-sync information are sent.
Original description:
I try the binlog router with MariaDB Enterprise 10.6.14. Eventually it stops reading binlog events from the master:
MaxScale log:
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2023-07-08 12:39:11 error : (Replication-Proxy); Error received during replication from '172.31.1.142:3306': Failed to fetch binlog event from master:
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2023-07-08 12:39:13 error : (Replication-Proxy); Error received during replication from '172.31.1.142:3306': Failed to fetch binlog event from master:
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...
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MariaDB [(none)]> show slave status\G
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*************************** 1. row ***************************
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Slave_IO_State: Reconnecting after a failed primary event read
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Master_Host: 172.31.1.142
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Master_User: xxxxxx
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Master_Port: 3306
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Connect_Retry: 1
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Master_Log_File: mariadb-bin.000001
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Read_Master_Log_Pos: 2756715
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...
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Last_Errno: -1
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Last_Error: Failed to fetch binlog event from master:
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...
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Gtid_IO_Pos: 0-18334-2749960
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...
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The binlog from MaxScale ends with the COMMIT for GTID 0-18334-2749960 and fails with the next GTID being announced at position 2756805 in mariadb-bin.000009.
The last good binlog event and the failed one decoded:
mysqlbinlog --start-position=2756774 --stop-position=2756847 --hexdump /data/clustrix/mariadb/mariadb-bin.000009
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# at 2756774
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#230708 12:39:10 server id 18334 end_log_pos 2756805 CRC32 0x6c726826
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# Position
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# |Timestamp |Type |Master ID |Size |Master Pos |Flags
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# 2a10a6 |ee 58 a9 64 |10 |9e 47 00 00 |1f 00 00 00 |c5 10 2a 00 |00 00
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#
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# 2a10b9 fb 4b 55 03 00 00 00 00 26 68 72 6c |.KU.....&hrl|
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#
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# Event: Xid = 55921659
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COMMIT/*!*/;
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# at 2756805
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#230708 12:39:11 server id 18334 end_log_pos 2756847 CRC32 0x286242e3
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# Position
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# |Timestamp |Type |Master ID |Size |Master Pos |Flags
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# 2a10c5 |ef 58 a9 64 |a2 |9e 47 00 00 |2a 00 00 00 |ef 10 2a 00 |08 00
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#
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# 2a10d8 09 f6 29 00 00 00 00 00 00 00 00 00 0c 00 00 00 |..).............|
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# 2a10e8 00 00 00 e3 42 62 28 |....Bb(|
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#
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# Event: GTID 0-18334-2749961 trans
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/*!100001 SET @@session.gtid_seq_no=2749961*//*!*/;
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START TRANSACTION
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/*!*/;
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DELIMITER ;
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# End of log file
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Attached:
- my.cnf from master
- maxscale.cnf
- maxscale log
- the maxscale copy of the binlog
