[Building Sakai] More on: Performance issue with group member items in gradebook

[David Haines]

This is an update on some responses at Michigan to the gradebook
performance issues noted in SAK-22978.

The changes implemented for
https://jira.sakaiproject.org/browse/SAK-22978are very good.  That
said they explicitly do not address the issue of many
people requesting the same data at once or requesting it multiple times.
 E.g. an instructor may send an email to 1,300 students letting them know
that all the grades will be available at 6pm and people may be reloading
the page until they get the grades (or the system goes down).   At Michigan
we've run into that problem more than once so we created a Jira (
https://jira.sakaiproject.org/browse/SAK-23321 ) to add data caching across
users. Caching was discussed in but isn't part of SAK-22978. Thoughts about
this Jira are welcome.

Also please note that the SAK-22978 work will not address Mneme where we
have found similar issues.

- Dave
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