@Override
  public Set<PersistentID> getMissingPersistentMembers() throws AdminException {
    connectAdminDS();
    DistributionManager dm = getDistributionManager();
    if (dm == null) {
      throw new IllegalStateException(
          "connect() has not been invoked on this AdminDistributedSystem.");
    }
    return getMissingPersistentMembers(dm);
  }
If the <code>ExecutionException</code> is caused by an <code>InterruptedException</code>,
throw the <code>CancellationException</code> instead.
geode-core/src/main/java/org/apache/geode/admin/internal/AdminDistributedSystemImpl.java