    const string& dir_with_data = JoinPathSegments(ets_src->data_dirs()[0], "data");
    ASSERT_GT(inspect_->CountFilesInDir(dir_with_data), 3);
  });

  // Now kick off the tablet copies.
  HostPort src_addr;
  ASSERT_OK(HostPortFromPB(ts_src->registration.rpc_addresses(0), &src_addr));
  vector<thread> threads;
  auto copy_tablet_with_index = [&] (int i) {
    LOG(INFO) << Substitute("Copying tablet $0 / $1", i + 1, kNumTablets);
    const string& tablet_id = tablets[i].tablet_status().tablet_id();