@Override
  public long getPlanSizeMb() {
    long total = 0;
    for (NormalizationTarget target : normalizationTargets) {
      total += target.getRegionSizeMb();
    }
    return total;
  }
Normalization plan to merge adjacent regions. As with any call to
{@link MasterServices#mergeRegions(RegionInfo[], boolean, long, long)} with
{@code forcible=false}, Region order and adjacency are important. It's the caller's
responsibility to ensure the provided parameters are ordered according to the {code mergeRegions}
method requirements.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/normalizer/MergeNormalizationPlan.java