After applying a workaround for issue #809, I notice that ab will quite consistently fail with only few number of repeated requests:
$ ab -k -s 30 -n 400 -c 100 http://host.example.com/some/path/hello_world
This is ApacheBench, Version 2.3 <$Revision: 1430300 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking hcc-briantest7.unl.edu (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
apr_pollset_poll: The timeout specified has expired (70007)
Total of 398 requests completed
This is a fairly vanilla setup - should be reproducible with the HTTP module on top of a POSIX filesystem.
I haven't been able to diagnose it precisely, but it seems to only occur when this line pops into the log:
180828 16:07:34 880 ofs_Stall: Stall 3: File hello_world is being staged; estimated time to completion 3 seconds for /some/path/hello_world
I admit, I don't understand why the file would ever be considered as being staged with the default OFS plugin. However, the behavior is very much as if there's a callback not occurring.
NOTE this issue is based on an investigation into user complaints about the service. It may be a synthetic benchmark but it shows something actually observed in the wild.
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