@Override
    public void fromDelta(DataInput in) throws IOException, InvalidDeltaException {
      boolean nameC = in.readBoolean();
      if (nameC) {
        name = in.readUTF();
      }
      boolean addressC = in.readBoolean();
      if (addressC) {
        address = in.readUTF();
      }
    }
test putIfAbsent with failover & retry. This is bugs 42559 and 43640
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/ConcurrentMapOpsDUnitTest.java