over time, cache tags can get lots of big numbers in them.

berdir: 10:14 catch: yep, we should do that, looking at a cache_tags table of an older d8 site, I have menu:admin deletions: 37000 :)

let's figure out how to clean them up, maybe during a flush all caches calls or similar.

CommentFileSizeAuthor
#2 reset-cache-tags-2250033-2.patch1.77 KBberdir

Comments

catch’s picture

catch
he/him
Primary language English
commented

This might want to wait on #918538: Decouple cache tags from cache bins although it's not a hard blocker.

I'm thinking a method like resetCacheTags() and we call that on all backends as part of drupal_flush_all_caches().

berdir’s picture

berdir
Primary language German
Location Switzerland
commented
Status: Active » Needs review
StatusFileSize
new reset-cache-tags-2250033-2.patch1.77 KB

Here's a patch.

We already have a reset() that only resets static cache tags. Calling the new method in tests all the time would be a bit ugly, because we don't want to invalidate stored cache tags, just the static cache there. A better name would have made sense for that, Berdir--.

berdir’s picture

berdir
Primary language German
Location Switzerland
commented
Issue tags: +Needs tests
wim leers’s picture

wim leers
Location Ghent 🇧🇪🇪🇺
commented

Sounds like a good plan at first sight :)

+++ b/core/lib/Drupal/Core/Cache/CacheTagsChecksumInterface.php
@@ -54,6 +54,13 @@ public function getCurrentChecksum(array $tags);
+   * Called after clearing all stored caches.

Not actually true yet, unless you're referring to the invocation in drupal_flush_all_caches().

berdir’s picture

berdir
Primary language German
Location Switzerland
commented
Status: Needs review » Needs work

Well, how else would you write it?

It *has* to be called after doing that, everything else would mess up the caches. It's only safe to call it after (or maybe even better, before). It's instructions for whoever wants to call it (which will likely never be anyone else except dfac()).

catch’s picture

catch
he/him
Primary language English
commented
Title: figure out how to do cleanups on cache tags » Garbage collection for cache tag invalidations
Priority: Normal » Major
imiksu’s picture

imiksu
Location Finland
commented
Assigned: Unassigned » imiksu

I'll try to write tests for this.

imiksu’s picture

imiksu
Location Finland
commented
Assigned: imiksu » Unassigned

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fgm’s picture

fgm
Primary language French
Location Paris, France
commented

A tiny problem with this is that it breaks alternate cache implementations like the current version of Redis in RedisCacheTagsChecksum, because they don't implement that new method on CacheTagsChecksumInterface.

berdir’s picture

berdir
Primary language German
Location Switzerland
commented

Absolutely, the patch that I wrote is from february 2105, before 8.0.0.

To do this now, we need to do it in a new, optional interface (with the option to merge/require it with 9.0)

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smustgrave’s picture

smustgrave commented
Status: Needs work » Postponed (maintainer needs more info)
Issue tags: +stale-issue-cleanup

Thank you for creating this issue to improve Drupal.

We are working to decide if this task is still relevant to a currently supported version of Drupal. There hasn't been any discussion here for over 8 years which suggests that this has either been implemented or is no longer relevant. Your thoughts on this will allow a decision to be made.

Since we need more information to move forward with this issue, the status is now Postponed (maintainer needs more info). If we don't receive additional information to help with the issue, it may be closed after three months.

Thanks!

catch’s picture

catch
he/him
Primary language English
commented
Status: Postponed (maintainer needs more info) » Closed (outdated)

I think this got fixed by #3097393: Cache tags grow endlessly

Now that this issue is closed, review the contribution record.

As a contributor, attribute any organization that helped you, or if you volunteered your own time.

Maintainers, credit people who helped resolve this issue.