protected synchronized long[] getSubprocedureIds() {
    if (subprocs == null) {
      return null;
    }
    return subprocs.stream().mapToLong(Procedure::getProcId).toArray();
  }
Called by the ProcedureExecutor to mark rollback execution
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/RootProcedureState.java