Hello Graham, Completely forgot to mention those important details. Sorry about that.
We are running worker MPM (multi-threaded). We also tried refining the apache log level since we read about that recommendation in other posts. We set the level to trace and observed no additional details about the error. Only the "IOError: failed to write data" message and nothing more. Thank you On Friday, July 19, 2013 10:44:18 PM UTC+1, Graham Dumpleton wrote: > > What Apache MPM are you using and what are the MPM settings? > > What else are you running on this Apache server. > > When using daemon mode this error can also be due to the Apache child > worker processes that are proxying requests to the daemon processes being > killed off. > > Make sure you have LogLevel set to info in Apache and see what messages > Apache/mod_wsgi is producing when it occurs beyond just the IOError details. > > Graham > > On 20/07/2013, at 5:26 AM, Tera Byte <[email protected]<javascript:>> > wrote: > > Hello, > > I have seen this question asked at least another time here at modwsgi > group but it looks like there is no concrete answer until now (?). > > I'm streaming quite large media files from django + mod_wsgi but the > streaming terminates abruptly in an almost randomly fashion. The file in > question is about 600MB and the streaming usually terminates between 150 or > 200MB streaming progress. > > The error message that is written into the log files is the famous > "IOError: failed to write data". Nothing more is written even if I refine > the log level. > > The django application when deployed in the development server works > flawlessly. But when deployed in Apache together with mod_wsgi causes the > problem. > > I'm running mod_wsgi in "daemon process mode". The server has 4GB of total > RAM, being 3GB available during the test scenario I have isolated. > > The django application is returning an iterator like the following, where > data is a urllib2 data stream: > > class FileIterWrapper(object): > def __init__(self, data): > self.data = data > self.chunk_size = 4096 > > def next(self): > data_block = self.data.read(self.chunk_size) > if len(data_block) == 0: > raise StopIteration > else: > return data_block > > def __iter__(self): > return self > > > I really need help with this one. The streaming component of the overall > application could be easily migrated to another technology / application > server but the goal is to stick all with django and mod_wsgi. > > Any pointers? > > Thank you > > > -- > You received this message because you are subscribed to the Google Groups > "modwsgi" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > To post to this group, send email to [email protected] <javascript:> > . > Visit this group at http://groups.google.com/group/modwsgi. > For more options, visit https://groups.google.com/groups/opt_out. > > > > > -- You received this message because you are subscribed to the Google Groups "modwsgi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/modwsgi. For more options, visit https://groups.google.com/groups/opt_out.
