protected boolean trackMessage(FunctionStreamingReplyMessage m) {
    Status status;
    status = statusMap.get(m.getSender());
    if (status == null) {
      status = new Status();
      statusMap.put(m.getSender(), status);
    }
    return status.trackMessage(m);
  }
Return true if this is the very last reply msg to process for this member
geode-core/src/main/java/org/apache/geode/internal/cache/execute/FunctionStreamingResultCollector.java