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.

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1answer
47 views

Are question timestamps “before x min” cached on Stack Exchange sites?

I was reading once that the Stack Exchange sites are using caching heavily. Checking the HTML source of a site, when logged-in and when being an anonymous visitor, shows in both cases (example): <...
5
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1answer
86 views

User with one badge, but can't see any in user page?

I'm a Home Improvement reviewer, and spend a lot of time greeting new users using the wonderful SE-AutoReviewComments to give boilerplate encouraging comments. One of my big questions is whether they'...
3
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0answers
53 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, ...
4
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0answers
61 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 ...
1
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1answer
55 views

Per-site Meta reputation updating… slowly [duplicate]

I answered a question on Stack Overflow and it got an upvote. After a great several minutes I went to Meta Stack Overflow, and was surprised that my reputation was still 10 less than main, indicating ...
9
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1answer
175 views

Icons For Hot Questions Are Wrong [duplicate]

Self descript. I know it's already been asked here and here. But apparently it's still an issue. This only started happening to me this week that I've noticed. Per the comments in the linked answer, a ...
5
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0answers
63 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 ...
3
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1answer
44 views

“Featured on meta” in community bulletin not updating [duplicate]

Not sure if this is just excessive caching, or something else: We had two meta items tagged as featured but only the original item is displaying. 11 hours ago we remove the tag from the original item, ...
-6
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1answer
72 views

Why aren't tag scores updated live?

I'm kind of wondering… why can't there be cached tag scores updated live (e.g. when one of my answers is upvoted), like there are for reputation? I'm not saying that there shouldn't be the script ...
6
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1answer
73 views

Winter Bash Leaderboard showing 0 hats when hats are earned?

Why does the Winter Bash Leaderboard show 0 hats when hats are earned? Is it due to caching? (some sites are hidden)
8
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1answer
80 views

Tag score updated in one tag, but not others for same answer?

On Meta Stack Overflow, I have a recent answer scoring 11 for feature-requestdocumentationreview-audits. The funny thing is that my tag score for documentation has updated to 11, but feature-request ...
7
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0answers
47 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 ...
3
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1answer
85 views

When are deleted questions counted among tagged questions?

I have encountered an interesting situation with topology tag on MathOverflow. It currently says "2 questions tagged topology" and only one question was displayed. (See the screenshot below.) On the ...
4
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1answer
86 views

Why is my edited post count not updating?

On SFF.SE, I have made several edits recently, in the past few hours (I think around 20 edits). Before I started, my edit count was 155. Now it shows 156. Why has it not updated? (I know that tag wiki ...
1
vote
1answer
27 views

User scores are out of order in the “week” tab

When a new week recently began, I noticed something strange in the "week" tab: I know this is just a bug "feature" with caching, but I wonder why an update to the scores on this page does not also ...
16
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1answer
147 views

Mod Flag History: 2+2=50

I'd like to blame caching, but I can't shake the feeling that something's flaky here: That's a bug, right? No matter which tab I'm looking at (day|week|month|whatever), nothing ever seems to add up. ...
4
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1answer
500 views

Hitting back in the browser does not remember my saved edits or comments [duplicate]

This appears to be a bug in StackOverflow and on other StackExchange sites. I only so far tested with Firefox: Edit a question or answer, or add a comment, save it Go to another page in the same tab ...
1
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0answers
44 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: ...
-17
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1answer
177 views

The SO logo on the wall of whatever room in your castles is not updated [closed]

So, in this recent blog post I can see that the logo on the wall is the old one: Yeah, this logo was valid until SO was SVGified. However, after SVGifation, the logo has changed: Shouldn't ...
1
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0answers
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 ...
5
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0answers
51 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 ...
11
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1answer
2k views

How does Stack Exchange achieve High Availability with Redis?

I'm curious about Stack Exchange's HA setup for Redis. Based on existing blog posts and other answers, I understand that there are 2 nodes per instance per datacenter - a master and a slave. But how ...
2
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1answer
53 views

“Duplicate” label on question disappears

When leaving a question and going to another tab for a while, the question's Duplicate marking disappears. The question is also treated like it is brand new, with a banner to show new answers. Actual:...
3
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0answers
43 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
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1answer
77 views

Old community promotion ads still showing up

I can reliably reproduce this after several shift+F5s: the old Community Promotion Ads are still showing up (at least on Programmers.SE), from 2014, not the new ones from 2015. Is this just another ...
9
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0answers
56 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 ...
15
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1answer
130 views

Caching should not show me yesterday's info!

I know the answer is always "caching" whenever the question is about inconsistent data, but this is ridiculous: I've cleared my browser cache, but when I look at my user profile on Server Fault, at ...
43
votes
1answer
385 views

Reliable count of votes that I've cast today

I often want to know how many votes (upvotes and downvotes) I've cast today, so as to know how far I am from the 40 vote limit. In the old days, this information was easily accessible on each page by ...
1
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0answers
28 views

The review page has outdated counters [duplicate]

When I go to review page I get something like this(enabled questions/answers for review): But then I click for example on "First Posts" I get: There are no items for you to review. I'm trying ...
6
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1answer
264 views

Please fix my back button

Here's a recipe for confusion: Load a page on Stack Exchange. Do anything that updates the page via JS―leave a comment, vote, etc. Leave the page by following a link. Use the browser's back button to ...
22
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2answers
2k views

Browser caching has become a bit too aggressive

Until a couple of hours ago, my usual experience on SE sites has been that the homepage, individual question pages, etc., would be revalidated and reloaded whenever I navigated around with Back and ...
3
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0answers
118 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 ...
38
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2answers
11k views

How does Stack Exchange work around the lack of Redis clustering?

I read that Stack Exchange uses Redis for caching and Redis doesn't have clustering support yet. So I was just wondering how Stack exchange works around this lack of an important feature? Does it use ...
1
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0answers
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, ...
4
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0answers
60 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 ...
2
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0answers
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 ...
8
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0answers
52 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 ...
3
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2answers
77 views

Different reputation shown on user profile page

Header refreshes correctly automatically on increase in reputations, but the changes are not immediately reflected on the profile.
-4
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2answers
160 views

Weird Behavior when Down-voting an answer [duplicate]

I found a weird bug in SO today when I tried to down vote an answer that had completely wrong suggestion to solve an issue. Now, when I down-voted the answer, it had already been deleted (possibly by ...
5
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0answers
872 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 ...
4
votes
1answer
142 views

What time zone and time scale do SE sites use? [duplicate]

I am often puzzled by the time indication on this platform I asked a question yesterday and this morning I noticed that I asked it today: Since it is already past midnight on the west coast in the ...
4
votes
1answer
85 views

Search results showing questions without the searched for tag in results

Recently, I was surfing on stackoverflow.com & I have found one bug in Question filter. I was looking under the java tag and yet I saw questions which were not tagged java The incorrectly shown ...
5
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0answers
81 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 ...
9
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2answers
94 views

Difference in score between Linked and Related questions - is it caching, or a bug?

I was browsing this discussion (URL Shorteners cleanup) and noticed in the related posts lists the following difference in the score on a linked question (Let Me Flag That For You - URL Shortener ...
2
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0answers
34 views

Deleted questions remain in the “Questions” listing [duplicate]

Very recently, a "question" containing profanity and an attack on all users of Stack Overflow was posted. The question was deleted (removed?) within 2 minutes of its posting. However, this did not ...
2
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0answers
61 views

Why doesn't this question appear under tagged questions? [duplicate]

I posted this question some minutes ago, and I can reload that page to make sure it's there, but I cannot see it appear under the newest questions tagged "ruby". It is already several minutes ago. Why ...
19
votes
1answer
180 views

Do not cache the flag indicator for moderators

Since the flagging and closing changes back in June, I get the impression that the flag indicator is now cached (or more properly speaking buffered). I've observed several times on both FR and CS that ...
3
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1answer
627 views

What is caching, and where is it used?

This is meant to be a canonical Q&A for all the caching questions we get on meta What is caching? Where is caching employed across the network? Approximately how long ought it take for each ...
1
vote
1answer
56 views

Deleted answer got stuck in server cache

Active questions list, page 4 as of right now: It's way over two days and the link points to this deleted answer: What caused the answer to get stuck in the list? Lots of posts get deleted ...
20
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0answers
242 views

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, ...