maria-discuss team mailing list archive

[Guillaume Lefranc <guillaume@xxxxxxxxxxxx>]

Hi Paul,

I don't think that will work across clusters. Your best bet is usually not
to rely on GTID for cross-cluster replication.

Regards
GL

Le jeu. 2 nov. 2017 à 06:30, Warner, Paul <pwarner@xxxxxxxxx> a écrit :

> Hi!
>
>
> I have two Galera clusters of three nodes each, let's call them cluster A
> and cluster B.
>
>
> Cluster B has one member set up as a slave to one of the members in
> cluster A.
>
>
> The cluster B member that runs the slave protocol shows it's GTID matches
> that of the nodes in cluster A, but the other two nodes in cluster B (not
> running slaves themselves, but in the cluster with the node running as a
> slave) have GTIDs that are always 4 behind the other nodes.
>
>
> So just to lay it out again:
>
>
> A0 5-24-5 - master
>
> A1 5-24-5
>
> A2 5-24-5
>
>
> B0 5-24-5 - slave to A0
>
> B1 5-24-1
>
> B2 5-24-1
>
>
> The  GTIDS stay 4 apart, and replication seems fine.   I add rows on any A
> cluster node and they show up in all three B nodes.  The GTID on the node
> running slave stays in sync with the A cluster.
>
>
> The A0 cluster is set up using xtrabackupv2 for SST.
>
>
> The A cluster is completely up before doing anything on the B cluster.
>
>
> The B cluster is started like:
>
>
>    1. Start B0 as first node in the Galera cluster
>    2. mysqldump from A0 to B0 with --gtid.
>    <https://gist.github.com/warnerpr/011cabb876600c33e5bee42d7d0b17d2>
>    https://gist.github.com/warnerpr/011cabb876600c33e5bee42d7d0b17d2
>    3. Master of B0 is set to A0
>    4. Slave is started on B0
>    5. B1 and B2 are started and set to join the existing cluster.
>
>
> Cluster A and B have log_slave_updates = ON.
>
> Details:
> B0 Slave -
> https://gist.github.com/warnerpr/59c287bb201302961742bb89d5035559
> B1 - https://gist.github.com/warnerpr/0fb8825e49bce72761e0bdd95b0512d9
> A1 Master -
> https://gist.github.com/warnerpr/91e0df1eb04f425baca3675335639c0f
>
>
> Any pointers are greatly appreciated!
>
> Paul
>
>
>
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