message: [tf.data service] Rename dispatcher journal directory.
diff: @@ -44,7 +44,7 @@ namespace data {
  namespace {
  // The name of the journal directory inside the dispatcher's working directory.
  -constexpr char kJournalDir[] = "journal";
  +constexpr char kJournalDir[] = "tf_data_dispatcher_journal";
  using Dataset = DispatcherState::Dataset;
  using Worker = DispatcherState::Worker;
  