Can't cache All region locations of the specify table by calling table.getRegionLocator().getAllRegionLocations()

// code placeholder
public List<HRegionLocation> getAllRegionLocations() throws IOException {
  TableName tableName = getName();
  NavigableMap<HRegionInfo, ServerName> locations =
      MetaScanner.allTableRegions(this.connection, tableName);
  ArrayList<HRegionLocation> regions = new ArrayList<>(locations.size());
  for (Entry<HRegionInfo, ServerName> entry : locations.entrySet()) {
    regions.add(new HRegionLocation(entry.getKey(), entry.getValue()));
  }
  if (regions.size() > 0) {
    connection.cacheLocation(tableName, new RegionLocations(regions));
  }
  return regions;
}

In MetaCache

public void cacheLocation(final TableName tableName, final RegionLocations locations) {
  byte [] startKey = locations.getRegionLocation().getRegionInfo().getStartKey();
  ConcurrentMap<byte[], RegionLocations> tableLocations = getTableLocations(tableName);
  RegionLocations oldLocation = tableLocations.putIfAbsent(startKey, locations);
  boolean isNewCacheEntry = (oldLocation == null);
  if (isNewCacheEntry) {
    if (LOG.isTraceEnabled()) {
      LOG.trace("Cached location: " + locations);
    }
    addToCachedServers(locations);
    return;
  }

// code placeholder
public RegionLocations getCachedLocation(final TableName tableName, final byte [] row) {
  ConcurrentNavigableMap<byte[], RegionLocations> tableLocations =
    getTableLocations(tableName);

  Entry<byte[], RegionLocations> e = tableLocations.floorEntry(row);
  if (e == null) {
    if (metrics!= null) metrics.incrMetaCacheMiss();
    return null;
  }
  RegionLocations possibleRegion = e.getValue();

  // make sure that the end key is greater than the row we're looking
  // for, otherwise the row actually belongs in the next region, not
  // this one. the exception case is when the endkey is
  // HConstants.EMPTY_END_ROW, signifying that the region we're
  // checking is actually the last region in the table.
  byte[] endKey = possibleRegion.getRegionLocation().getRegionInfo().getEndKey();
  if (Bytes.equals(endKey, HConstants.EMPTY_END_ROW) ||
      getRowComparator(tableName).compareRows(
          endKey, 0, endKey.length, row, 0, row.length) > 0) {
    if (metrics != null) metrics.incrMetaCacheHit();
    return possibleRegion;
  }

  // Passed all the way through, so we got nothing - complete cache miss
  if (metrics != null) metrics.incrMetaCacheMiss();
  return null;
}