code: public void evictCache(Path hdfsPath, Path localPath, long size)
      throws IOException {
      boolean done = cacheFs.delete(localPath, false);
      if (!done) {
        if (LOG.isDebugEnabled()) {
          LOG.debug("Evict for path: " + hdfsPath +
                    " local path " + localPath + " unsuccessful.");
        }
      }
    }
docs: Evicts a file from the cache. If the cache is exceeding capacity,
  then the cache calls this method to indicate that it is evicting
  a file from the cache. This is part of the Eviction Interface.