Hello,
Considering the following architecture:
- N-nodes MariaDB Galera Cluster
- Standalone MariaDB server replicating from any above cluster node
In the case where the master node is restarted, the slave stops with this error:
1593 The slave I/O thread stops because a fatal error is encountered when it tried to SELECT @master_binlog_checksum. Error: WSREP has not yet prepared node for application use
It has to be restarted manually (START SLAVE) in order to reconnect
As Galera replication implies that, when a node is restarted, there is a short time when the node is available on port 3306, but the node cannot accept commands because it is processing an Incremental State Transfer request, I propose to have the slave thread autoreconnect instead of stopping when it encounters this particular error.
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Bug
Critical
A fix and a test for this issue are available in the following merge:
https://github.com/codership/mysql-wsrep-bugs/commit/ec4a6fa61ca6be5424040048d0727ebadf271d00
Note that the fix is (currently) wrapped in WITH_WSREP directives, so it will only take effect in binaries compiled with -DHAVE_WSREP=1