IOError: [Errno 90] Message too long

[marc1n]

uWSGI does not handle properly printing to stdout big strings when using logger option.

$ uwsgi --version
2.0.13.1

$ uname -a
Linux 4.4.0-22-generic #40-Ubuntu SMP Thu May 12 22:03:46 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Example:

$ rm -f /tmp/uwsgi.log; uwsgi --http=:9090 --logger=file:/tmp/uwsgi.log --eval='print "x" * 300000'; tail /tmp/uwsgi.log
Python version: 2.7.11+ (default, Apr 17 2016, 14:00:29) [GCC 5.3.1 20160413]
*** Python threads support is disabled. You can enable it with --enable-threads ***
Python main interpreter initialized at 0x144f9c0
your server socket listen backlog is limited to 100 connections
your mercy for graceful operations on workers is 60 seconds
mapped 145536 bytes (142 KB) for 1 cores
*** Operational MODE: single process ***
Traceback (most recent call last):
File "uwsgi_eval_config", line 1, in
IOError: [Errno 90] Message too long

[marc1n]

Maybe it is the same reason as in #1266 - stdout is set as nonblocking.

Errno 90 == EMSGSIZE and https://linux.die.net/man/2/send:
EMSGSIZE
The socket type requires that message be sent atomically, and the size of the message to be sent made this impossible.

[marc1n]

Any ideas?

[marc1n]

If we set option log-master-stream = true than we have error from issue #1266

[skob]

any news ?..

[sindhujit]

Received same issue in our app recently.
we have

master = True
daemonize   =   true
# logging
logger  =   file:Path to log file

# clear environment on exit
vacuum  =   true

any news on this guys?

[marc1n]

I've finally found a workaround. Set the option --log-master-bufsize to a value bigger than printed string (for example 1000000). Default is 8192.

[sindhujit1]

I've finally found a workaround. Set the option --log-master-bufsize to a value bigger than printed string (for example 1000000). Default is 8192.

This did not work for me. I added three zeros on top of 1000000. Still gives same error.