private synchronized void clear() {
    // this.results = new TreeMap(new SnapshotNameComparator());
    snaps = null;
    notHeardFrom = new ArrayList();
    heardFrom = new ArrayList();
  }
Resets the internal state of this <code>CacheCollector</code>
geode-core/src/main/java/org/apache/geode/internal/admin/CacheCollector.java