Hello all,
Hopefully I'm not asking an question that's been answered many times
before; I've been unable to find anything via Google.
Short version:
When I attempt to stream data to a uwsgi server running a JSONRPC
application, every other request fails with the error 'Error writing
request body to server', even if the data is < 100B. This effect where
the first request succeeds, the second fails, third succeeds, etc. is
completely reproducible and constant. When I set up the client so that
it buffers the request and then sends it all in one piece everything
works normally. Also, if I start the server via
wsgiref.simple_server.make_server.serve_forever() everything works normally.
More details:
I'm currently testing with Java code; the error can be toggled on by
setting one of
http://docs.oracle.com/javase/7/docs/api/java/net/HttpURLConnection.html#setFixedLengthStreamingMode%28int%29
http://docs.oracle.com/javase/7/docs/api/java/net/HttpURLConnection.html#setChunkedStreamingMode%28int%29
Also, putting nginx in front of the server fixes the problem, presumably
because nginx buffers the entire request before sending it to uwsgi.
Interestingly, if I sleep for at least 5s prior to each request, the
problem is resolved. At 4s every second request fails.
The uwsgi command line is:
uwsgi --master --processes 20 --cheaper 4 \
--http :10000 --http-timeout 600 --pidfile pyservice.pid
--daemonize uwsgi.log \
--wsgi-file PyLogServer.py
My uwsgi version is pretty old, 1.4.4. Ubuntu is 12.04.
Any ideas what might be causing this problem / debugging suggestions?
Are there any more details I could provide that might be useful?
Thanks, Gavin
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