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  1. MariaDB Server
  2. MDEV-4920

Semi-sync slave plugin assumes only one master

        Details

        • Type: Bug
        • Status: Closed
        • Priority: Major
        • Resolution: Duplicate
        • Affects Version/s: 10.0.4
        • Fix Version/s: None
        • Component/s: None
        • Labels:
          None

          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.

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                duplicates

                Technical task - A technical task. MDEV-3793 Multi-source: Semisync replication is not fully supported for multiple masters and can cause replication failure and relay log corruption

                • Minor - Minor loss of function, or other problem where easy workaround is present.
                • Open

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                  elenst Elena Stepanova added a comment -

                  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 .

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                  elenst Elena Stepanova added a comment - 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 .
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                  elenst Elena Stepanova added a comment -

                  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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                  elenst Elena Stepanova added a comment - 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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                    • Assignee:
                      Unassigned
                      Reporter:
                      pivanof Pavel Ivanov
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                      • Created:
                        Updated:
                        Resolved: