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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 Jan 1 '13 at 7:35
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Most likely a bug, stuff like this happen and fixed quickly. –  Shadow Wizard 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 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 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 Jan 1 '13 at 9:22

1 Answer 1

up vote 5 down vote accepted

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.

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Nice, status-completed then or aren't you sure yet it's working properly? –  Shadow Wizard 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. ;) –  Shadow Wizard 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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