@Override
  public void fromData(DataInput in,
      DeserializationContext context)
      throws IOException, ClassNotFoundException {
    memberIdentifier.fromData(in, context);
    durableClientAttributes = null;
  }
Returns this client member's durable attributes or null if no durable attributes were created.
geode-core/src/main/java/org/apache/geode/distributed/internal/membership/InternalDistributedMember.java