public Map<Integer, Integer> getSizeLocally() {
    return getSizeLocally(false);
  }
This method iterates over localBucket2RegionMap and returns collective size of the bucket
regions. <br>
Steps: <br>
1) Check if localBucket2RegionMap is empty. If it is, return 0.<br>
2) If localBucket2RegionMap is not empty, get keyset of all these bucket IDs. <br>
3) Get the nodeList for the bucket ID from Bucket2Node region. <br>
4) If first node from the node list is current node, increment the size counter. <br>
5) Step#4 takes care of the problem of recounting the size of redundant buckets. <br>


@return the map of bucketIds and their associated sizes, or {@link Collections#EMPTY_MAP}when
        the size is zero
geode-core/src/main/java/org/apache/geode/internal/cache/PartitionedRegionDataStore.java