fluent/fluentd · error · ArgumentError

#{self.name}: default value specified twice for #{name}

Error message

#{self.name}: default value specified twice for #{name}

What it means

Error "#{self.name}: default value specified twice for #{name}" thrown in fluent/fluentd.

Source

Thrown at lib/fluent/config/configure_proxy.rb:334

      def config_param(name, type = nil, **kwargs, &block)
        name, block, opts = parameter_configuration(name, type, **kwargs, &block)

        if @current_description
          config_set_desc(name, @current_description)
          @current_description = nil
        end

        @sections.delete(name)
        @params[name] = [block, opts]
        name
      end

      def config_set_default(name, defval)
        name = name.to_sym

        if @defaults.has_key?(name)
          raise ArgumentError, "#{self.name}: default value specified twice for #{name}"
        end

        @defaults[name] = defval
        nil
      end

      def config_set_desc(name, description)
        name = name.to_sym

        if @descriptions.has_key?(name)
          raise ArgumentError, "#{self.name}: description specified twice for #{name}"
        end

        @descriptions[name] = description
        nil
      end

      def desc(description)

View on GitHub (pinned to dd45c6e18d)

When it happens

Trigger: Thrown at lib/fluent/config/configure_proxy.rb:334 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of fluent/fluentd@dd45c6e18d (2026-08-21). Data as JSON: /api/errors/1d406e6a4dbc35f8. Report an issue: GitHub.