@Override
  public void fromData(DataInput in,
      DeserializationContext context) throws IOException, ClassNotFoundException {
    super.fromData(in, context);
    bucketId = in.readInt();
  }
This message may be sent to nodes before the PartitionedRegion is completely initialized due to
the RegionAdvisor(s) knowing about the existence of a partitioned region at a very early part
of the initialization
geode-core/src/main/java/org/apache/geode/internal/cache/partitioned/BucketBackupMessage.java