code: public CPSubsystemConfig setCPMemberCount(int cpMemberCount) {
          checkTrue(cpMemberCount == 0 || cpMemberCount >= MIN_GROUP_SIZE, "CP subsystem must have at least "
                  + MIN_GROUP_SIZE + " CP members");
          this.cpMemberCount = cpMemberCount;
          return this;
      }
docs: Sets the CP member count. The CP subsystem is disabled if 0.
  Cannot be smaller than {@link #MIN_GROUP_SIZE} and {@link #groupSize}
  
  @return this config instance