@Override
  public void fromData(DataInput in,
      DeserializationContext context) throws IOException, ClassNotFoundException {
    super.fromData(in, context);
    persistentIds = DataSerializer.readHashSet(in);
  }
The response to a {@link PrepareBackupRequest}, {@link AbortBackupRequest}, or
{@link FinishBackupRequest}.
geode-core/src/main/java/org/apache/geode/internal/cache/backup/BackupResponse.java