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  1. Thrift
  2. THRIFT-4591

lua client uses two write() calls per framed message send

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Details

    • Improvement
    • Status: Closed
    • Minor
    • Resolution: Fixed
    • 0.11.0
    • 0.12.0
    • Lua - Library
    • None
    • Important

    Description

      1) realize thrift server with TNonblockingServer via c++;

      2) realize thrift client via lua lib and choose frame transport.

      3) call remote interface failed with "TTransportException:0: Default (unknown)" print, and the server show "TConnection::workSocket(): THRIFT_EAGAIN (unavailable resources)" error.

      4)investigate this fault with tcpdump tool, attachment 9090.pcap show the frame msg doesnot contains frame size field, the rifht situation of attachment 9090_1.pcap show the frame msg contains 4 bytes (00 00 00 25) before protocol id field.

      5) dig into the fault and tried to find root cause, then i found there is an fault in TFramedTransport:flush function in TFramedTransport.lua file. the original realization is:


      function TFramedTransport:flush()
        if self.doWrite == false then
          return self.trans:flush()
        end

        – If the write fails we still want wBuf to be clear
        local tmp = self.wBuf
        self.wBuf = ''
        local frame_len_buf = libluabpack.bpack("i", string.len(tmp))
        self.trans:write(frame_len_buf)
        self.trans:write(tmp)
        self.trans:flush()
      end


      which send frame size file and reset msg content independently.

      Attachments

        1. 9090.pcap
          0.9 kB
          allen_lee
        2. 9090_1.pcap
          0.8 kB
          allen_lee

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              jking3 James E. King III
              allen_lee allen_lee
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