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Tracking known Sakai performance issues that we need need to address

sakai_2-5-x

sakai_2-4-x

  • SAK-9860 : Excessive db queries generated from Site Info / user service
    • From Ian: 
      Just commited a fix agaisnt SAK-9860

Its not a total fix, but you should be able to patch 2.4.x (once fully tested) and the profiler is saying the 
number of queries for a since request is now 1 rather than 4 the first time per user and then 0 after that.

Needs testing though, and only eliminates the EID/ID SQL.
  • SAK-11279 : Spurious presence events
    • From Stephen: 
      Hi all,

If you're running 2.4.0 or 2-4-x in production with presence enabled, you will probably want to apply the fix to presence/courier from:

http://jira.sakaiproject.org/jira/browse/SAK-11279

This is a bug that logs 2 presence events every time a presence refresh is made (every 30s per user). Fixing this reduced the volume of presence events in our production system by a factor of 10 or more.

Regards
Stephen
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