Tim Abbott bd3c0aef9b presence: Optimize performance of mobile_query. ...

I'm not sure exactly what series of history got us here, but we were
fetching the mobile_user_ids data for all users in the organization,
regardless of whether they were recently active (and thus relevant for
the main presence data set).  And doing so in a sloppy fashion
(sending every user ID over the wire, rather than just having the
database join on Realm).

Fixing this saves a factor of 4-5 on the total runtime of a presence
request on organizations with 10Ks of users like chat.zulip.org; more
like 25% in an organization with 150.  Since large organizations are
very heavily weighted in the overall cost of presence, this is a huge
win.

Fixes part of #13734.

2020-05-14 23:23:37 -07:00

6.8 KiB

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