[MDEV-4920] Semi-sync slave plugin assumes only one master Created: 2013-08-19  Updated: 2013-08-26  Resolved: 2013-08-26

Status: Closed
Project: MariaDB Server
Component/s: None
Affects Version/s: 10.0.4
Fix Version/s: None

Type: Bug Priority: Major
Reporter: Pavel Ivanov Assignee: Unassigned
Resolution: Duplicate Votes: 0
Labels: None

Issue Links:
Duplicate
duplicates MDEV-3793 Multi-source: Semisync replication is... Closed

 Description   

Current semi-sync slave plugin implementation assumes that MariaDB has only one master and only one slave IO thread. As an example it has global variables semi_sync_need_reply and rpl_semi_sync_slave_status which should be per-master. Also I'd think object repl_semisync_slave should be per-master too.
As general MariaDB design is done for multi-master replication, semi-sync slave plugin should be adjusted for that too.

 Comments   
Comment by Elena Stepanova [ 2013-08-19 ]

This shortcoming is documented here https://kb.askmonty.org/en/multi-source-replication/#todo as a limitation of the current implementation, and is waiting to be fixed as MDEV-3793 .

Comment by Elena Stepanova [ 2013-08-26 ]

Closing as a duplicate of MDEV-3793.
If you think it's not quite a duplicate and should be considered separately, please feel free to comment/re-open it.

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