protected synchronized boolean setRollback() {
    if (running == 0 && state == State.FAILED) {
      state = State.ROLLINGBACK;
      return true;
    }
    return false;
  }
Called by the ProcedureExecutor to mark rollback execution
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/RootProcedureState.java