MySQL Utilities 1.4 Manual  /  ...  /  Section failure_tracking

8.6.10. Section failure_tracking

This section contains parameters for the failure management system.

notifications

The notification threshold. If more than this number of notifications arrive in the notification interval and the number of distinct notification clients are over the notification client threshold, the server is considered dead and failover is triggered.

notification_clients

The number of distinct notification clients that need to report. If more than this number of distinct notification clients are over the notification client threshold and the number of notifications above the notification threshold arrive in the notification interval, the server is considered dead and failover is triggered.

notification_interval

The notification interval in seconds. Only notifications arriving within this time frame can trigger a failover.

failover_interval

The minimum interval between failover operations in seconds. In order to avoid making the system unstable, failover operations are not triggered unless at least this much time has expired since the last failover.

detections

This parameter is for the built-in failure detector. If more than this number of failures to contact the server occurs during the detection interval, the server is considered unstable and a failover is triggered.

detection_interval

This parameter configures the detection interval for the built-in failure detector, in seconds.

detection_timeout

This parameter configures the detection timeout used when attempting to contact the servers in the group.

prune_time

This is the maximum age of events in the failure detector's error log and is also the interval for how often the error log is pruned.


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