Questions tagged [caching]

The caching tag should be used when asking about how SE caches web pages and data. Also for when encountering any perceived errors/bugs that you think have to do with caching.

27 questions with no upvoted or accepted answers
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20 votes
0 answers
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Which global "counters" (reputation, badges, ...) are computed and updated on the fly? How?

I have searched meta for an answer, but found only some bits. Interesting bits, but still something is missing from the big picture. It is widely known that reputation is both updated on the fly, ...
10 votes
0 answers
60 views

Show related questions immediately after posting

See: Why does the Related question list not always show up? The answer there states that it is an expensive query to run, so it's not done immediately. I remember reading somewhere else that due to ...
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9 votes
0 answers
77 views

Will be nice to have "force flair cache update"

I know there is a flair cache (about 24 hours to expire). I understand that this is needed for performance. It will be nice however to have ability to click "force flair update". It can be CAPTCHA-...
8 votes
0 answers
54 views

Edit history shows an edit that I can't see on the question

Relates to this question: Encoding and decoding get parameters in CodeIgniter not working The screenshot below shows how I can currently see the page. Note the last editor and the presence of the PLZ ...
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7 votes
0 answers
54 views

Community sidebar isn't updating featured list

About 19 hours ago, I edited the featured tag out of a question and into another. About 7 hours ago, I made a few other small changes. The sidebar still hasn't updated to list the new questions. I'd ...
user avatar
7 votes
0 answers
77 views

"Caching in" on the 2.0 sites

As of the last month or so, I've noticed a dramatic increase in the amount of time it takes between submitting a question and it appearing on the front page or 'Questions' tab, from on the order of ...
  • 16.6k
6 votes
0 answers
75 views

Review queue sizes are incorrect

The review queue sizes on the /review page on Stack Apps (and maybe other sites as well) are off. When I visit https://stackapps.com/review/ in a private browser window (or while logged in with a ...
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5 votes
0 answers
66 views

Why hasn't my profile picture updated on SE.com?

I changed my profile picture across SE on May 23rd. My profile picture on stackexchange.com still hasn't updated, though. I've used Update profile info several times, and it still hasn't changed. I ...
  • 56.9k
5 votes
0 answers
54 views

The chat box is lagging behind

The chat box in the sidebar is constantly lagging behind. Right now on math.SE it's showing this: But in reality, four math.SE rooms have been active since then, and there has been ample time for the ...
user avatar
5 votes
0 answers
897 views

Does Stack Overflow use redis for output caching?

I've read that Stack Overflow uses Redis for distributed caching and also Output Caching but was curious as to whether a custom OutputCache Provider is used to store the output cache in the Redis ...
5 votes
0 answers
84 views

How many different caches affect reputation count?

I understand that reputation is cached and updated every once in a while, so I'm not surprised by seeing inconsistent values across different areas of the SE network. However I was wondering how many ...
4 votes
0 answers
89 views

What is it about the "Ask Question" button that makes it update my Area51.meta profile?

In Area 51, if my main profile gets some form of update, like an avatar or reputation change, I have to wait a while for my Discussions profile to update (sync) due to caching. However, I can just ...
4 votes
0 answers
66 views

Vote counts don't update on posts when votes are invalidated

When votes are invalidated on posts, either due to voter deletion or invalidation by CM's, the votes on the posts are not updated until someone clicks to "View the upvote and downvote totals", or ...
3 votes
0 answers
54 views

Why is there such a long delay between casting votes and them registering on your summary tab?

I go into the Home tab and look over many different questions. On some, I vote but I have noticed a significant delay between voting and the vote registering in my Profile/Summary page. For example, ...
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3 votes
0 answers
44 views

Rep widget seems to overwrite SE app's cache

I can live with a little cache lag. But this one is a little weird: I thought the widget was using the same data as the SE app... So the widget lags behind (I'm fine with that) and says I have 28,035 ...
3 votes
0 answers
124 views

Do you store crucial information in redis at the primary store, and then flush?

I love redis, but I'm curious how a large scale site like SE uses redis and if there are certain parts of the system where redis is used as a primary store. I understand how redis is used as a 2nd ...
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2 votes
0 answers
30 views

Inbox updates outpacing Question/Answer Caching in Android App

I asked a question a few minutes ago (from the Android app, if it matters). An answer was provided, and within seconds of it being answered, the push notification registered on my phone that an answer ...
  • 59.5k
2 votes
0 answers
85 views

How long does it take before new questions actually appear?

When I ask a new question it takes some time to get visible on the [Questions]-->[Newest] tab on the main page. Sometimes this delay is several minutes. Even some cases I see the new questions along ...
2 votes
0 answers
118 views

There is a time delay on number of answers

I answered a question that showed up on the main screen. I went back to the main screen. It said "0 Answers". I refreshed. It said "0 Answers". I clicked the question again, refreshed, went back ...
  • 9,572
1 vote
0 answers
39 views

Network Profile cached files don't update for all events

The problem: Two years ago, I asked a question on User Experience that received 13 upvotes: For death year, should I use N/A or --- if person still alive? Six months ago, a user was removed, and the ...
  • 1,395
1 vote
0 answers
63 views

How long is the cache refresh time in stackexchange.com?

I just changed my username, because I quit eating Unicorns. However, its been 2 days and in SE.com, it still shows my old username: Also, I noticed that going to my profile page refreshed the cache: ...
1 vote
0 answers
23 views

Can the tag counts be the same?

On the tag home page, I see this: Note the x 7895. But on the tag's own page, I see this: Here it says 8020. I guess that one (the latter) is cached? Please could they both be right? Or both be ...
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1 vote
0 answers
20 views

What causes inconsistency of displaying Questions when Tags is selected

Say you remove some tag from a bunch of Questions, and then click on that Tag to see what other Questions remain. Very often you'll find some of the same Questions from which you've removed the tag, ...
  • 9,815
1 vote
0 answers
39 views

Posts white-out after browser tab has been open for a while

I've noticed some strange behavior a lot lately. In Safari, if I leave a tab open to a StackOverflow post for a while, then navigate back to it, parts of the post are whited-out. Is this a web browser ...
  • 1,058
1 vote
0 answers
774 views

Avoid reload when taking Back button to homepage

Sometimes a question on the homepage catches my eye just as I've clicked something else, and by the time I've clicked Back to return to the homepage it's disappeared from view. I'd prefer it if, when ...
  • 963
1 vote
0 answers
115 views

Invalidate cache when new question is posted

The Newest tab is cached for 2 minutes. This means that if a new question is posted, it may not appear for up to 2 minutes. Is there a way to increase the cache time, but invalidate the cache ...
0 votes
0 answers
39 views

Time needed to refresh questions list from a cache

How much time must pass, before my newly asked question will appear on my questions list? Currently (as of moment of writing this), thirteen 34 minutes has passed and there is no such update. This ...
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