public void addToOfflineRegions(final RegionStateNode regionNode) {
    LOG.info("Added to offline, CURRENTLY NEVER CLEARED!!! " + regionNode);
    regionOffline.put(regionNode.getRegionInfo(), regionNode);
  }
Get the number of regions in transition.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/RegionStates.java