New option to allow lower versions for replicas #67
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There may be a situation when one would need to be able to rearrange topology in such way thet server with higher version will be LEADER for REPLICA that has lower version. This patch allows that by introduction of AllowLowerVersionForReplication option which is turned off by default. Once enabled each time such change will be made, warning will be written into log file.
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It should be noted that this type of operation is unsupported by MariaDB. https://mariadb.com/kb/en/replication-overview/#cross-version-replication-compatibility For anyone else coming along you should upgrade your replicas first, swap the primary to an upgraded server, then upgrade the previous primary. |
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Description
There may be a situation when one would need to be able to rearrange topology in such way that server with higher version will be LEADER for REPLICA that has lower version. This patch allows that by introduction of AllowLowerVersionForReplication option which is turned off by default. Once enabled each time such change will be made, warning will be written into log file.