private static long getEntryIdDelta(CountingDataInputStream dis, int idByteCount)
      throws IOException {
    assert idByteCount >= 1 && idByteCount <= 8 : idByteCount;

    long delta;
    delta = dis.readByte();
    idByteCount--;
    while (idByteCount > 0) {
      delta <<= 8;
      delta |= (0x00FF & dis.readByte());
      idByteCount--;
    }
    return delta;
  }
Returns true if the drId region has been destroyed or if oplogKeyId preceeds the last clear
done on the drId region
geode-core/src/main/java/org/apache/geode/internal/cache/Oplog.java