default void memberJoined(DistributionManager distributionManager, InternalDistributedMember id) {
    // implement if needed
  }
This method is invoked when a new member joins the system

@param distributionManager that is calling this listener
@param id The id of the new member that has joined the system
geode-core/src/main/java/org/apache/geode/distributed/internal/MembershipListener.java