MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
You can use the MySQL Performance Schema to monitor Group Replication. These Performance Schema tables display information specific to Group Replication:
These Performance Schema replication tables also show information relating to Group Replication:
replication_connection_status
shows
information regarding Group Replication, such as transactions
received from the group and queued in the applier queue (relay
log).
replication_applier_status
shows
the states of channels and threads relating to Group
Replication. These can also be used to monitor what individual
worker threads are doing.
Replication channels created by the Group Replication plugin are listed here:
group_replication_recovery
: Used for
replication changes related to distributed recovery.
group_replication_applier
: Used for the
incoming changes from the group, to apply transactions coming
directly from the group.
For information about system variables affecting Group Replication, see Section 17.7.1, “Group Replication System Variables”. See Section 17.7.2, “Group Replication Status Variables”, for status variables providing information about Group Replication.
If you are monitoring one or more secondary instances using
mysqladmin, you should be aware that a
FLUSH STATUS
statement executed by
this utility creates a GTID event on the local instance which may
impact future group operations.