protected synchronized boolean setRollback() {
    if (running == 0 && state == State.FAILED) {
      state = State.ROLLINGBACK;
      return true;
    }
    return false;
  }
Called by the {@link ProcedureExecutor} to mark rollback execution.
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/procedure/RootProcedureStack.java