protected void readMvccVersion(final int offsetFromPos) {
      // See if we even need to decode mvcc.
      if (!this.reader.getHFileInfo().shouldIncludeMemStoreTS()) {
        return;
      }
      if (!this.reader.getHFileInfo().isDecodeMemstoreTS()) {
        currMemstoreTS = 0;
        currMemstoreTSLen = 1;
        return;
      }
      _readMvccVersion(offsetFromPos);
    }
Read mvcc. Does checks to see if we even need to read the mvcc at all.
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileReaderImpl.java