public void resetLastPeeked() {
    peekedIds.clear();
    extraPeekedIds.clear();
    lastPeekedId.set(-1);
  }
Clear the list of peeked keys. The next peek will start again at the head key.
geode-core/src/main/java/org/apache/geode/internal/cache/wan/serial/SerialGatewaySenderQueue.java