uWSGI listen queue of socket full

[StefanoSperetta]

After the app has run for quite some time, the webserver stops working.
This error can be seen in the logs:

app_1 | Tue Jan 9 04:04:46 2024 - *** uWSGI listen queue of socket ":8000" (fd: 3) full !!! (101/100) ***

This is probably the solution.

If WSGI starts responding slowly, nginx might have already closed the connection, throwing an error.

[StefanoSperetta]

It seems the feature is working but some more testing is needed...

proxy_1       | 86.88.247.37 - - [09/Jan/2024:21:53:21 +0000] "GET /next-pass/39428/ HTTP/2.0" 200 935 "https://delfispace.tudelft.nl/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36" "-"
app_1         | [pid: 66|app: 0|req: 435/413] 86.88.247.37 () {52 vars in 1102 bytes} [Tue Jan  9 21:53:21 2024] GET /next-pass/39428/ => generated 935 bytes in 10 msecs (HTTP/2.0 200) 5 headers in 158 bytes (1 switches on core 1)
app_1         | Tue Jan  9 21:53:28 2024 - *** HARAKIRI ON WORKER 1 (pid: 66, try: 1, graceful: yes) ***
app_1         | Tue Jan  9 21:53:28 2024 - HARAKIRI !!! worker 1 status !!!
app_1         | Tue Jan  9 21:53:28 2024 - HARAKIRI [core 0] 86.88.247.37 - GET /location/all/ since 1704837203
app_1         | Tue Jan  9 21:53:28 2024 - HARAKIRI !!! end of worker 1 status !!!
app_1         | Tue Jan  9 21:53:28 2024 - HARAKIRI triggered by worker 1 core 0 !!!
proxy_1       | 86.88.247.37 - - [09/Jan/2024:21:53:28 +0000] "GET /location/all/ HTTP/2.0" 502 559 "https://delfispace.tudelft.nl/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36" "-"
app_1         | DAMN ! worker 1 (pid: 66) died, killed by signal 9 :( trying respawn ...
app_1         | Respawned uWSGI worker 1 (new pid: 69)
proxy_1       | 86.88.247.37 - - [09/Jan/2024:21:53:31 +0000] "GET /location/all/ HTTP/2.0" 200 197 "https://delfispace.tudelft.nl/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36" "-"
app_1         | [pid: 69|app: 0|req: 437/414] 86.88.247.37 () {52 vars in 1096 bytes} [Tue Jan  9 21:53:29 2024] GET /location/all/ => generated 197 bytes in 1769 msecs (HTTP/2.0 200) 5 headers in 158 bytes (1 switches on core 0)```

[StefanoSperetta]

Interesting warning on the delfitlm_app container

*** WARNING: you have enabled harakiri without post buffering. Slow upload could be rejected on post-unbuffered webservers ***

[StefanoSperetta]

Based on this, the last warning should be ignored.

[StefanoSperetta]

The system has been stable over the last couple of days, this modification seems working fine.

[StefanoSperetta]

No problem observed for months, the issue can be closed.