2021-12-01
- Atmire merged some changes I had submitted to the COUNTER-Robots project
- I updated our local spider user agents and then re-ran the list with my
check-spider-hits.sh script on CGSpace:
$ ./ilri/check-spider-hits.sh -f /tmp/agents -p
Purging 1989 hits from The Knowledge AI in statistics
Purging 1235 hits from MaCoCu in statistics
Purging 455 hits from WhatsApp in statistics
Total number of bot hits purged: 3679
2021-12-02
- Francesca from Alliance asked me for help with approving a submission that gets stuck
- I looked at the PostgreSQL activity and the locks are back up like they were earlier this week
$ psql -c "SELECT application_name FROM pg_locks pl LEFT JOIN pg_stat_activity psa ON pl.pid = psa.pid" | sort | uniq -c | sort -n
1
1 ------------------
1 (1437 rows)
1 application_name
9 psql
1428 dspaceWeb
- Last month I enabled the
log_lock_waits in PostgreSQL so I checked the log and was surprised to find only a few since I restarted PostgreSQL three days ago:
# grep -E '^2021-(11-29|11-30|12-01|12-02)' /var/log/postgresql/postgresql-10-main.log | grep -c 'still waiting for'
15
- I think you could analyze the locks for the
dspaceWeb user (XMLUI) and find out what queries were locking… but it’s so much information and I don’t know where to start
- For now I just restarted PostgreSQL…
- Francesca was able to do her submission immediately…
- On a related note, I want to enable the
pg_stat_statement feature to see which queries get run the most, so I created the extension on the CGSpace database
- I was doing some research on PostgreSQL locks and found some interesting things to consider
- The default
lock_timeout is 0, aka disabled
- The default
statement_timeout is 0, aka disabled
- It seems to be recommended to start by setting
statement_timeout first, rule of thumb ten times longer than your longest query
- Mark Wood mentioned the
checker cron job that apparently runs in one transaction and might be an issue
- I definitely saw it holding a bunch of locks for ~30 minutes during the first part of its execution, then it dropped them and did some other less-intensive things without locks
- Bizuwork was still not receiving emails even after we fixed the SMTP access on CGSpace
- After some troubleshooting it turns out that the emails from CGSpace were going in her Junk!
2021-12-03
- I see GARDIAN is now using a “GARDIAN” user agent finally
- I will add them to our local bot override for Solr