[wp-trac] [WordPress Trac] #6966: cron: prevent duplicate events

[WordPress Trac]

#6966: cron: prevent duplicate events
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 Reporter:  tellyworth  |       Owner:  anonymous
     Type:  defect      |      Status:  new      
 Priority:  normal      |   Milestone:  2.7      
Component:  General     |     Version:           
 Severity:  normal      |    Keywords:           
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 This is an unusual case but worth defending against:

 If a user submits many posts in a short period of time (perhaps with XML-
 RPC), the cron array can fill up with a backlog of do_pings events.  Since
 do_pings operates on all posts, there's no reason to have more than one of
 these events scheduled.

 The enclosed patch changes wp_schedule_single_event() to ignore new events
 if there is already an identical event scheduled within 10 minutes of the
 new one.  (It also handles the case where there's a backlog of events with
 timestamps in the past).  The hook and args must be identical for it to be
 skipped.  10 minutes is arbitrary but seems reasonable; it could be an
 external define if there's a need to change it.

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Ticket URL: <http://trac.wordpress.org/ticket/6966>
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