private int countMobFiles(TableName tn, String familyName) throws IOException {
    FileSystem fs = TEST_UTIL.getTestFileSystem();
    Path mobFileDir = MobUtils.getMobFamilyPath(TEST_UTIL.getConfiguration(), tn, familyName);
    if (fs.exists(mobFileDir)) {
      return fs.listStatus(mobFileDir).length;
    }
    return 0;
  }
Generate the mob value. the size of the value
@return the mob value generated
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestDeleteMobTable.java