protected void failStageIf(Stage stage) throws IOException {
    Stage current = getTestStage();
    if (current == stage) {
      throw new IOException("Failed stage " + stage + " in testing");
    }
  }
Backup request execution.
@throws IOException if the execution of the backup fails
hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/impl/TableBackupClient.java