@Override
    public void memberDeparted(DistributionManager distributionManager,
        InternalDistributedMember id, boolean crashed) {
      if (id.equals(sender)) {
        cancelRevoke(pattern);
      }

    }
Return the set of member ids which this resource knows are missing
geode-core/src/main/java/org/apache/geode/internal/cache/persistence/PersistentMemberManager.java