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The "related questions" column has disappeared from the sidebar on SO.

screenshot

Is this a permanent change? ("Eeeek!") Or is it the first time I have witnessed this cache quirk: The “related questions” panel gone on Stackoverflow is sometimes missing? I find that column useful from time to time, though I'm sure I could make do with the search box.

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    Also seems missing here on Meta. – Charles Jan 1 '13 at 7:34
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    It was there a second ago here on Meta. – Asad Saeeduddin Jan 1 '13 at 7:35
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    Most likely a bug, stuff like this happen and fixed quickly. – ShaWiz Jan 1 '13 at 7:37
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    Quick! To the Wheel of Blame! – animuson Jan 1 '13 at 7:38
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    If you notice, the "active" part of the question stats is missing as well. It's also missing when I look at this very question. – BoltClock's a Unicorn Jan 1 '13 at 7:48
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    Y2013 bug. We all expected something. – Michael Petrotta Jan 1 '13 at 7:51
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    i cann't see in this question either i.stack.imgur.com/cDBVQ.png – NullPoiиteя Jan 1 '13 at 7:53
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    The weird part is that this doesn't seem to be a UI bug. On old questions like this, the related links are still present. It is just new questions that don't have them. – Asad Saeeduddin Jan 1 '13 at 7:59
  • The API seems to be broken as well, it returns no related questions for new questions and behaves normally for old questions. – Asad Saeeduddin Jan 1 '13 at 8:49
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    @Asad: I imagine that the related questions are cached and stored with the question. They likely get updated very infrequently, unless a user-generated event triggers one (such as editing, which could change the content and/or title). It would be a huge performance issue to try and generate that list every time the question loads. – animuson Jan 1 '13 at 8:54
  • On MSO looks like questions as of 8 hours ago have the related column, but the next question does not. – psubsee2003 Jan 1 '13 at 9:08
  • @animuson That is very likely the answer to this question. According to the info on this page, related questions lists are heavily cached. Also, user generated events do not trigger a refresh: "[the list] may not update immediately after a question has been edited." – Asad Saeeduddin Jan 1 '13 at 9:22
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We managed to make elastic search hard crash - it's back up and I'm taking a look at the 140gig heap dump now. Related questions will reappear on all questions as they're accessed.

Note: as far as this question goes, , but I'm still looking into the root cause.

  • Nice, status-completed then or aren't you sure yet it's working properly? – ShaWiz Jan 1 '13 at 10:26
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    @ShaWizDowArd - it's like trusting a computer after it blue screens...you just don't until you find and fix the root cause. – Nick Craver Jan 1 '13 at 10:27
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    blue screen is like blue sky.. it's just there. ;) – ShaWiz Jan 1 '13 at 10:28
  • Then as far as this answer goes, I'll accept it. Thanks! – Sam Jan 1 '13 at 17:17

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