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Slightly adjust the semi-sync documentation

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Johan Wikman
2016-10-05 13:38:50 +03:00
parent e54c40ca7b
commit 84cadd4c45
2 changed files with 8 additions and 6 deletions
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9
Documentation/Routers/Binlogrouter.md
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@ -94,12 +94,13 @@ This defines whether (on | off) MariaDB MaxScale sends to the slave the heartbea
### `semisync` ### `semisync`
This parameter controls whether binlog server could ask Master server to start the Semi-Synchronous replication. This parameter controls whether binlog server could ask Master server to start the Semi-Synchronous replication.
In order to get semi-sync working the Master server must have the *rpl_semi_sync_master* plugin installed. In order to get semi-sync working, the Master server must have the *rpl_semi_sync_master* plugin installed.
The available plugin and the value of GLOBAL VARIABLE *rpl_semi_sync_master_enabled* are checked in the Master registration phase: if plugin is installed in the Master database the binlog server then requests the semi-sync option. The availability of the plugin and the value of the GLOBAL VARIABLE *rpl_semi_sync_master_enabled* are checked in the Master registration phase: if the plugin is installed in the Master database, the binlog server subsequently requests the semi-sync option.
Note: Note:
- the network replication stream from Master has two additional bytes before each binlog event. - the network replication stream from Master has two additional bytes before each binlog event.
- the Semi-Sync protocol requires an acknoledge packet to be sent back to Master only when requested: the semi-sync flag will have value of 1. - the Semi-Sync protocol requires an acknowledge packet to be sent back to Master only when requested: the semi-sync flag will have value of 1.
This flag is set only if *rpl_semi_sync_master_enabled=1* in the Master, otherwise it will always have value of 0 and no ack packet is sent back. This flag is set only if *rpl_semi_sync_master_enabled=1* is set in the Master, otherwise it will always have value of 0 and no ack packet is sent back.
Please note that semi-sync replication is only related to binlog server to Master communication. Please note that semi-sync replication is only related to binlog server to Master communication.
### `ssl_cert_verification_depth` ### `ssl_cert_verification_depth`

5
Documentation/Tutorials/Replication-Proxy-Binlog-Router-Tutorial.md
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@ -131,10 +131,11 @@ The default value is off, set *transaction_safety=on* to enable the incomplete t
This parameter controls whether binlog server could ask Master server to start the Semi-Synchronous replication. This parameter controls whether binlog server could ask Master server to start the Semi-Synchronous replication.
In order to get semi-sync working the Master server must have the *rpl_semi_sync_master* plugin installed. In order to get semi-sync working the Master server must have the *rpl_semi_sync_master* plugin installed.
The available plugin and the value of GLOBAL VARIABLE *rpl_semi_sync_master_enabled* are checked in the Master registration phase: if plugin is installed in the Master database the binlog server then requests the semi-sync option. The availability of the plugin and the value of the GLOBAL VARIABLE *rpl_semi_sync_master_enabled* are checked in the Master registration phase: if the plugin is installed in the Master database the binlog server subsequently requests the semi-sync option.
Note: Note:
- the network replication stream from Master has two additional bytes before each binlog event. - the network replication stream from Master has two additional bytes before each binlog event.
- the Semi-Sync protocol requires an acknoledge packet to be sent back to Master only when requested: the semi-sync flag will have value of 1. - the Semi-Sync protocol requires an acknowledge packet to be sent back to Master only when requested: the semi-sync flag will have value of 1.
This flag is set only if *rpl_semi_sync_master_enabled=1* in the Master, otherwise it will always have value of 0 and no ack packet is sent back. This flag is set only if *rpl_semi_sync_master_enabled=1* in the Master, otherwise it will always have value of 0 and no ack packet is sent back.
Please note that semi-sync replication is only related to binlog server to Master communication. Please note that semi-sync replication is only related to binlog server to Master communication.