@Override
    public boolean equals(Object o) {
      if (!(o instanceof CacheKey)) {
        return false;
      }
      CacheKey other = (CacheKey) o;
      // TableName should be the only thing differing..
      return tn.equals(other.tn) && conn.equals(other.conn) && conf.equals(other.conf)
        && fs.equals(other.fs);
    }
Returns the {@link FileArchiverNotifier} instance for the given {@link TableName}.
@param tn The table to obtain a notifier for
@return The notifier for the given {@code tablename}.
hbase-server/src/main/java/org/apache/hadoop/hbase/quotas/FileArchiverNotifierFactoryImpl.java