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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (THRIFT-4591) lua client uses two write() calls per framed message send
Date Thu, 05 Jul 2018 17:45:00 GMT


ASF GitHub Bot commented on THRIFT-4591:

jeking3 commented on issue #1566: THRIFT-4591:cannot read call result via lua lib
   "THRIFT_EAGAIN (unavailable resources)" means your process ran out of resources; you may
want to look at your process limits, or see if you are sending a message too large (but not
larger than the maximum frame size).

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> lua client uses two write() calls per framed message send
> ---------------------------------------------------------
>                 Key: THRIFT-4591
>                 URL:
>             Project: Thrift
>          Issue Type: Improvement
>          Components: Lua - Library
>    Affects Versions: 0.11.0
>            Reporter: allen_lee
>            Assignee: James E. King III
>            Priority: Minor
>             Fix For: 0.12.0
>         Attachments: 9090.pcap, 9090_1.pcap
>   Original Estimate: 4h
>  Remaining Estimate: 4h
> 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.

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