Tim Abbott f473cb5fbe Use bulk operations in notify_subscription_{added_removed}. ...

After fixing the high numbers of database queries earlier in this
branch, I found that sending 500 RabbitMQ messages for a bulk change
in subscriptions was consuming more than half the time for these (and
then we'd end up with 500 events in a queue).  To handle this, we
create a "user X subscribed to these N streams" event, rather than
sending one event for each individual subscription.

(imported from commit 44a34a9fab9b67e9f0da6fee53335d8c5030392b)

2013-07-02 10:50:29 -04:00

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