@Override
    public String toString() {
      return "<" + shortName() + " " + getProcessorId() + " targeting " + targetMember
          + " waiting for " + numMembers() + " replies out of " + originalCount + " "
          + (exception == null ? "" : (" exception: " + exception)) + " from " + membersToString()
          + ">";
    }
process the failure set from sending the message
geode-core/src/main/java/org/apache/geode/internal/cache/StateFlushOperation.java