public void close() throws IOException {
    if (sf != null) {
      sf.closeStoreFile(false);
      sf = null;
    }
  }
Closes the underlying reader, but do no evict blocks belonging to this file. It's not
thread-safe. Use MobFileCache.closeFile() instead.
hbase-server/src/main/java/org/apache/hadoop/hbase/mob/MobFile.java