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I noticed yesterday in a couple of questions and today in this one that, at least on my screen, the related questions are missing.

Why is this? Why does it only happen sometimes? Can I do it in such way that I can see it every time?

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  • $\begingroup$ I suppose that the system didn't find anything related; or that the sidebar has taken a quick sidebar and it will be back in the next episode of "Quests for Glory", err, I mean "Math S-E". $\endgroup$
    – Asaf Karagila Mod
    Commented Sep 5, 2014 at 14:20
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    $\begingroup$ Seeing that no Related sidebars were generated since my answer, I'm retagging as a bug. $\endgroup$
    – user147263
    Commented Sep 5, 2014 at 16:51
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    $\begingroup$ ... and now the problem went away. Related sidebar is shown for all questions expect the very new ones (posted within a few minutes). $\endgroup$
    – user147263
    Commented Sep 6, 2014 at 2:43
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    $\begingroup$ @Haney: How is this a non-repro? The answer below indicates that this is "automatically solved" for sufficiently old questions, so the linked question will have a "Related" sidebar. Instead take a look at the newest question posted at time of seeing this comment. I still see the problem occurring (and it's an annoying one, since the "Related" bar often includes a good source for duplicates). $\endgroup$
    – Asaf Karagila Mod
    Commented Sep 11, 2014 at 22:54
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    $\begingroup$ @Haney As of now, none of the questions posted since September 7 have the Related sidebar. Specifically, this one and all posted since then. $\endgroup$
    – user147263
    Commented Sep 11, 2014 at 23:35
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    $\begingroup$ I can confirm Friday's predecessor's observation. And I can't say that I've entered the question linked in his question before, so it's definitely not a caching issue in this aspect. $\endgroup$
    – Asaf Karagila Mod
    Commented Sep 12, 2014 at 0:20
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    $\begingroup$ Taking a look now, this is not working as expected and I was mistaken. $\endgroup$
    – Haney
    Commented Sep 12, 2014 at 13:34

2 Answers 2

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Well this was fun; basically, our background processing for these... stopped background processing. It looks like it is related to some async changes that were introduced (and possibly the dreaded sync-context deadlock that people using .NET Tasks may be aware of). So; we have a bit of a backlog to churn through, and it is going to take some time to catch up and be as responsive as we would like. To help with this, I have changed this code to scale out over more of our background processing servers (when there wasn't a backlog, it was working fine on a "one server wins and does everything" basis; with a backlog, it needs more concurrency). I'll keep an eye on it - hopefully it will have caught up soon!

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It appears that the Related sidebar is slow to be built at the moment. To verify:

  1. Sort questions by newest
  2. Check that none of questions on the first page have Related sidebar.
  3. Check that earlier questions, starting from about the middle of page 2, have Related sidebar. Specifically, Prove that $V$ is a complete space is the most recent question with the Related sidebar.

Possible cause: search engine tubes are clogged, which happened earlier: Why don't I see the "related questions" column?

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    $\begingroup$ Informative as always. I confirmed your conjecture. $\endgroup$
    – Git Gud
    Commented Sep 5, 2014 at 15:11
  • $\begingroup$ It was a system hiccup that should be working as intended now. $\endgroup$
    – Haney
    Commented Sep 11, 2014 at 20:32
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    $\begingroup$ @JonasMeyer I am mistaken, this is clearly not working as intended. $\endgroup$
    – Haney
    Commented Sep 12, 2014 at 13:33

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