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The value of this system variable can be changed while Group Replication is running, and the change takes effect immediately. 

group_replication_flow_control_certifier_threshold  specifies the number of waiting transactions in the certifier queue that trigger flow control. 

• group_replication_flow_control_hold_percent 

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The value of this system variable can be changed while Group Replication is running, and the change takes effect immediately. 

group_replication_flow_control_hold_percent  defines what percentage of the group quota remains unused to allow a cluster under flow control to catch up on backlog. A value of 0 implies that no part of the quota is reserved for catching up on the work backlog. 

• group_replication_flow_control_max_commit_quota 

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