January 2019
Intermediate to advanced
286 pages
7h 41m
English
Content preview from Advanced MySQL 8
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Checking instance states
If you want to verify that an instance is good enough to join a cluster, you can use the cluster.checkInstanceState() function. This function validates a GTID and compares it to GTIDs already processed by a cluster. It also checks whether an instance that has processed transactions can be added to a cluster:
mysql-js> cluster.checkInstanceState('cluster_admin@node4:3306')
The output of the preceding function can be any of the following:
- OK new: Where the instance has not executed any GTID transactions, and cannot conflict with the GTIDs executed by the cluster
- OK recoverable: Where the instance has executed GTIDs that do not conflict with the executed GTIDs of the cluster seed instances
- ERROR diverged: Where the ...
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