@Override
    public void fromData(DataInput in,
        DeserializationContext context) throws IOException, ClassNotFoundException {
      super.fromData(in, context);
      regionPath = DataSerializer.readString(in);
      boolean persistentIDs = in.readBoolean();
      int len = in.readInt();
      lostVersionSources = new VersionSource[len];
      for (int i = 0; i < len; i++) {
        lostVersionSources[i] = (persistentIDs ? DiskStoreID.readEssentialData(in)
            : InternalDistributedMember.readEssentialData(in));
      }
    }
IDs that destroyed the region or crashed during GII that the GII recipient got events from
that weren't sent to this member
geode-core/src/main/java/org/apache/geode/internal/cache/InitialImageOperation.java