public NavigableMap<String, NavigableSet<CachedBlock>> getCachedBlockStatsByFile() {
      return this.cachedBlockByFile;
    }
@return True if full; i.e. there are more items in the cache but we only loaded up the
        maximum set in configuration <code>hbase.ui.blockcache.by.file.max</code> (Default:
        DEFAULT_MAX).
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/BlockCacheUtil.java