Method validate

src/master/quota_handler.cpp:129–140

Check whether the tree satisfies: parent guarantees >= sum(children guarantees) TODO(mzhu): Add limit check.

  //
  // TODO(mzhu): Add limit check.
  Option<Error> validate() const
  {
    // Don't check the root node because it does not have quota set.
    foreachvalue (const unique_ptr<Node>& child, root->children) {
      Option<Error> error = child->validate();
      if (error.isSome()) {
        return error;
      }
    }

    return None();
  }

  // Returns the total guaranteed resource quantities requested by
  // all quotas in the tree. Since a role's guarantees must be greater