confmaster/src/main/java/com/navercorp/nbasearc/confmaster/server/workflow/MGSetquorum.java
public void setquorum(PartitionGroupServer master, int q,
            String quorumMembers) throws MgmtSetquorumException,
            MgmtSmrCommandException {
        master.setQuorum(q, quorumMembers);
    }
public void setquorum(PartitionGroupServer master, int q,
            String quorumMembers) throws MgmtSetquorumException,
            MgmtSmrCommandException {
        master.setQuorum(q, quorumMembers);
    }
Since it is a singleton instance and represents a part of workflow logic running in multiple threads.