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MXS-839: Detect multi-master topologies with mysqlmon

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The mysqlmon now supports proper detection of multi-master topologies by
building a directed graph out of the monitored server. If cycles are found from
this graph, they are assigned a master group ID. All servers with a positive
master group ID will receive the Master status unless they have `@@read_only`
enabled.

This new functionality can be enabled with the 'multimaster' boolean
parameter.
This commit is contained in:
Markus Makela
2016-09-05 20:01:26 +03:00
parent d745781bd0
commit 46c8a6f66b
4 changed files with 261 additions and 3 deletions
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1
server/modules/monitor/mysqlmon.h
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@ -63,6 +63,7 @@ typedef struct
int replicationHeartbeat; /**< Monitor flag for MySQL replication heartbeat */
bool detectStaleMaster; /**< Monitor flag for MySQL replication Stale Master detection */
bool detectStaleSlave; /**< Monitor flag for MySQL replication Stale Master detection */
bool multimaster; /**< Detect and handle multi-master topologies */
int disableMasterFailback; /**< Monitor flag for Galera Cluster Master failback */
int availableWhenDonor; /**< Monitor flag for Galera Cluster Donor availability */
int disableMasterRoleSetting; /**< Monitor flag to disable setting master role */