[wp-trac] [WordPress Trac] #34732: Memory exhaustion on posts with thousands of comments

[WordPress Trac]

#34732: Memory exhaustion on posts with thousands of comments
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 Reporter:  pento         |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  4.4
Component:  Comments      |    Version:  trunk
 Severity:  blocker       |   Keywords:
  Focuses:  performance   |
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 The recent changes to `WP_Comment_Query::get_comments()` passes an array
 of all commend IDs to `_prime_comment_caches()`. This loads all of those
 comments, and tries to cache them.

 On posts with thousands of comments, this causes memory exhaustion - we're
 seeing this on WP.com posts with (approximately) more than 10,000
 comments.

 This behaviour is a regression in 4.4 - previously, there were no memory
 exhaustion errors on these posts.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34732>
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