fluent/fluentd · error · ArgumentError

BUG: max_bytes must be specified for UDP

Error message

BUG: max_bytes must be specified for UDP

What it means

Error "BUG: max_bytes must be specified for UDP" thrown in fluent/fluentd.

Source

Thrown at lib/fluent/plugin_helper/server.rb:173

        case proto
        when :tcp
          server = server_create_for_tcp_connection(shared, bind, port, backlog, socket_option_setter) do |conn|
            conn.data(&callback)
          end
        when :tls
          transport_config = if tls_options
                               server_create_transport_section_object(tls_options)
                             elsif @transport_config && @transport_config.protocol == :tls
                               @transport_config
                             else
                               raise ArgumentError, "BUG: TLS transport specified, but certification options are not specified"
                             end
          server = server_create_for_tls_connection(shared, bind, port, transport_config, backlog, socket_option_setter) do |conn|
            conn.data(&callback)
          end
        when :udp
          raise ArgumentError, "BUG: max_bytes must be specified for UDP" unless max_bytes
          if socket
            sock = socket
            close_socket = false
          else
            sock = server_create_udp_socket(shared, bind, port)
            socket_option_setter.call(sock)
            close_socket = true
          end
          server = EventHandler::UDPServer.new(sock, max_bytes, flags, close_socket, @log, @under_plugin_development, &callback)
        when :unix
          raise "not implemented yet"
        else
          raise "BUG: unknown protocol #{proto}"
        end

        server_attach(title, proto, port, bind, shared, server)
      end

View on GitHub (pinned to dd45c6e18d)

When it happens

Trigger: Thrown at lib/fluent/plugin_helper/server.rb:173 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/8a2158c9a3c85ed4. Report an issue: GitHub.