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133 lines
5.5 KiB
Markdown
133 lines
5.5 KiB
Markdown
+++
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date = "2015-11-23T17:00:57+03:00"
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author = "Alan Orth"
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title = "November, 2015"
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tags = ["Notes"]
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+++
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## 2015-11-22
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- CGSpace went down
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- Looks like DSpace exhausted its PostgreSQL connection pool
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- Last week I had increased the limit from 30 to 60, which seemed to help, but now there are many more idle connections:
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```
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$ psql -c 'SELECT * from pg_stat_activity;' | grep idle | grep -c cgspace
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78
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```
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<!--more-->
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- For now I have increased the limit from 60 to 90, run updates, and rebooted the server
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## 2015-11-24
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- CGSpace went down again
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- Getting emails from uptimeRobot and uptimeButler that it's down, and Google Webmaster Tools is sending emails that there is an increase in crawl errors
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- Looks like there are still a bunch of idle PostgreSQL connections:
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```
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$ psql -c 'SELECT * from pg_stat_activity;' | grep idle | grep -c cgspace
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96
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```
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- For some reason the number of idle connections is very high since we upgraded to DSpace 5
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## 2015-11-25
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- Troubleshoot the DSpace 5 OAI breakage caused by nginx routing config
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- The OAI application requests stylesheets and javascript files with the path `/oai/static/css`, which gets matched here:
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```
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# static assets we can load from the file system directly with nginx
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location ~ /(themes|static|aspects/ReportingSuite) {
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try_files $uri @tomcat;
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...
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```
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- The document root is relative to the xmlui app, so this gets a 404—I'm not sure why it doesn't pass to `@tomcat`
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- Anyways, I can't find any URIs with path `/static`, and the more important point is to handle all the static theme assets, so we can just remove `static` from the regex for now (who cares if we can't use nginx to send Etags for OAI CSS!)
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- Also, I noticed we aren't setting CSP headers on the static assets, because in nginx headers are inherited in child blocks, but if you use `add_header` in a child block it doesn't inherit the others
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- We simply need to add `include extra-security.conf;` to the above location block (but research and test first)
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- We should add WOFF assets to the list of things to set expires for:
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```
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location ~* \.(?:ico|css|js|gif|jpe?g|png|woff)$ {
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```
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- We should also add `aspects/Statistics` to the location block for static assets (minus `static` from above):
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```
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location ~ /(themes|aspects/ReportingSuite|aspects/Statistics) {
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```
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- Need to check `/about` on CGSpace, as it's blank on my local test server and we might need to add something there
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- CGSpace has been up and down all day due to PostgreSQL idle connections (current DSpace pool is 90):
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```
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$ psql -c 'SELECT * from pg_stat_activity;' | grep idle | grep -c cgspace
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93
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```
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- I looked closer at the idle connections and saw that many have been idle for hours (current time on server is `2015-11-25T20:20:42+0000`):
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```
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$ psql -c 'SELECT * from pg_stat_activity;' | less -S
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datid | datname | pid | usesysid | usename | application_name | client_addr | client_hostname | client_port | backend_start | xact_start |
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-------+----------+-------+----------+----------+------------------+-------------+-----------------+-------------+-------------------------------+-------------------------------+---
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20951 | cgspace | 10966 | 18205 | cgspace | | 127.0.0.1 | | 37731 | 2015-11-25 13:13:02.837624+00 | | 20
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20951 | cgspace | 10967 | 18205 | cgspace | | 127.0.0.1 | | 37737 | 2015-11-25 13:13:03.069421+00 | | 20
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...
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```
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- There is a relevant Jira issue about this: https://jira.duraspace.org/browse/DS-1458
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- It seems there is some sense changing DSpace's default `db.maxidle` from unlimited (-1) to something like 8 (Tomcat default) or 10 (Confluence default)
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- Change `db.maxidle` from -1 to 10, reduce `db.maxconnections` from 90 to 50, and restart postgres and tomcat7
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- Also redeploy DSpace Test with a clean sync of CGSpace and mirror these database settings there as well
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- Also deploy the nginx fixes for the `try_files` location block as well as the expires block
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## 2015-11-26
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- CGSpace behaving much better since changing `db.maxidle` yesterday, but still two up/down notices from monitoring this morning (better than 50!)
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- CCAFS colleagues mentioned that the REST API is very slow, 24 seconds for one item
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- Not as bad for me, but still unsustainable if you have to get many:
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```
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$ curl -o /dev/null -s -w %{time_total}\\n https://cgspace.cgiar.org/rest/handle/10568/32802?expand=all
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8.415
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```
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- Monitoring e-mailed in the evening to say CGSpace was down
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- Idle connections in PostgreSQL again:
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```
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$ psql -c 'SELECT * from pg_stat_activity;' | grep cgspace | grep -c idle
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66
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```
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- At the time, the current DSpace pool size was 50...
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- I reduced the pool back to the default of 30, and reduced the `db.maxidle` settings from 10 to 8
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## 2015-11-29
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- Still more alerts that CGSpace has been up and down all day
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- Current database settings for DSpace:
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```
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db.maxconnections = 30
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db.maxwait = 5000
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db.maxidle = 8
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db.statementpool = true
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```
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- And idle connections:
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```
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$ psql -c 'SELECT * from pg_stat_activity;' | grep cgspace | grep -c idle
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49
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```
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- Perhaps I need to start drastically increasing the connection limits—like to 300—to see if DSpace's thirst can ever be quenched
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- On another note, SUNScholar's notes suggest adjusting some other postgres variables: http://wiki.lib.sun.ac.za/index.php/SUNScholar/Optimisations/Database
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- This might help with REST API speed (which I mentioned above and still need to do real tests)
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