private void tableExists(AsyncClusterConnection conn, TableName tableName) throws IOException {
    if (!FutureUtils.get(conn.getAdmin().tableExists(tableName))) {
      throwAndLogTableNotFoundException(tableName);
    }
  }
@throws TableNotFoundException if table does not exist.
hbase-server/src/main/java/org/apache/hadoop/hbase/tool/BulkLoadHFilesTool.java