int getSizeThreshold() {
      return sizeThreshold;
    }
By default auto-balancer will avoid rebalancing, because a user can always trigger rebalance
manually. So in case of error or inconsistent data, return false. Return true if
<OL>
<LI>total transfer size is above threshold percent of total data size at cluster level
<LI>If some smaller capacity nodes are heavily loaded while bigger capacity nodes are
balanced. In such a scenario transfer size based trigger may not cause rebalance.
geode-rebalancer/src/main/java/org/apache/geode/cache/util/AutoBalancer.java