private static int countStoreFilesInFamilies(List<Region> regions, final byte[][] families) {
    int count = 0;
    for (Region region : regions) {
      count += region.getStoreFileList(families).size();
    }
    return count;
  }
Class to test asynchronous region admin operations.
@see TestAsyncRegionAdminApi2 This test and it used to be joined it was taking longer than our
     ten minute timeout so they were split.
hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestAsyncRegionAdminApi.java