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[Plugin: Yet Another Related Posts Plugin] cache rules cause thrashing in 3.1.3

jimsky7 — Sat, 23 Jan 2010 06:33:40 +0000

YARPP can cause thrashing and high CPU usage under certain conditions. In large WP blogs (thousands of posts) these can cripple the server. YARPP has a cache mode that greatly improves performance, but under these certain conditions, thrashing occurs.

This is YARPP 3.1.3 (and 3.1.4 beta)

Here is the detail:

I have a post, ID 9812. YARPP finds 3 related posts for it.

The info gets cached and you can see that 9812 has three IDs associated with it in the cache:

mysql> select reference_ID,ID from wp_yarpp_related_cache order by reference_ID;
+————–+——+
| reference_ID | ID |
+————–+——+
| 9812 | 0 |
| 9812 | 7761 |
| 9812 | 8032 |
| 9812 | 8049 |

Now I go browsing around as a user (not admin) looking at some other posts and the cached info stays the same…

UNTIL I view some post where YARPP finds that good old 9812 is related to the newly-browsed post.

YARPP deletes the info from the cache table for 9812, and instead we just have an indicator that some posts “point to 9812” but 9812 no longer points to any other posts:

+————–+——+
| reference_ID | ID |
+————–+——+
| 3548 | 9812 |
| 4226 | 9812 |
| 6351 | 9812 |
| 7987 | 9812 |
| 8764 | 9812 |
| 9708 | 9812 |

No author has changed anything in the system in the meanwhile. Nothing has changed except that some user has browsed to a page that YARPP determines is related to 9812. YARPP has deleted the 9812 info.

So 9812 now has to have its YARPP cache rebuilt for the next site visitor. In my case, this involves 2 MySQL processes and about 15 seconds of CPU time because of the size of the blog!

In sites with large numbers of posts (this one has thousands), and where the last few posts might all be somewhat related, YARPP can end up causing a lot of churning because it’s so frequently deleting the posts, even though no posts have actually changed.

Here’s what happens when the visitor browses back to 9812 – showing that the cache entries had to be re-created again.

+————–+——+
| reference_ID | ID |
+————–+——+
| 3548 | 9812 |
| 4226 | 9812 |
| 6351 | 9812 |
| 7987 | 9812 |
| 8764 | 9812 |
| 9708 | 9812 |
| 9812 | 0 |
| 9812 | 7761 |
| 9812 | 8032 |
| 9812 | 8049 |

I wonder if maybe YARPP doesn’t have to delete 9812 at all just because it discovered that some other posts think THEY are related to 9812.

[Plugin: Yet Another Related Posts Plugin] Display related posts in main index

Thu, 31 Dec 2009 23:02:58 +0000

Hi Mitch,

Is there any way we can display, or have the option to display, our related posts for each post in our Main Index and Archives as well?

I show the full bodies of all my posts in my main index, so people rarely see a single post view, which is the only way they can currently access the related posts feature other than the RSS feed. Obviously, it’d be great if they could access the related posts for each post without having to go to the single post view.

Thanks!

[Plugin: Yet Another Related Posts Plugin] WordPress database error

Ipstenu (Mika Epstein) — Mon, 27 Apr 2009 13:44:11 +0000

When I go to the admin page for Yarpp and look under the section for Website display code example, I get the error below. Of note, everything seems to work just fine!

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'and date > date_sub(now(),interval 600 minute)' at line 1]
select count(*) as count from wp_yarpp_related_cache where reference_ID = and date > date_sub(now(),interval 600 minute)

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1]
select post_content from wp_posts where ID =

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1]
select post_title from wp_posts where ID =

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' ',' ') on duplicate key update date = now(), body = ' ', title = ' '' at line 1]
insert into wp_yarpp_keyword_cache (ID,body,title) values (,' ',' ') on duplicate key update date = now(), body = ' ', title = ' '

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'and ID != 0' at line 1]
select ID from wp_yarpp_related_cache where reference_ID = and ID != 0

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1]
delete from wp_yarpp_related_cache where reference_ID =

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1]
select body from wp_yarpp_keyword_cache where ID =

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1]
select post_content from wp_posts where ID =

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1]
select post_title from wp_posts where ID =

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' ',' ') on duplicate key update date = now(), body = ' ', title = ' '' at line 1]
insert into wp_yarpp_keyword_cache (ID,body,title) values (,' ',' ') on duplicate key update date = now(), body = ' ', title = ' '

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1]
select body from wp_yarpp_keyword_cache where ID =

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1]
select title from wp_yarpp_keyword_cache where ID =

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1]
select post_content from wp_posts where ID =

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1]
select post_title from wp_posts where ID =

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' ',' ') on duplicate key update date = now(), body = ' ', title = ' '' at line 1]
insert into wp_yarpp_keyword_cache (ID,body,title) values (,' ',' ') on duplicate key update date = now(), body = ' ', title = ' '

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1]
select title from wp_yarpp_keyword_cache where ID =

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' ID, (0+ (MATCH (post_content) AGAINST ('')) * 3+ (MATCH (post_title) AGAINST ('' at line 1]
insert into wp_yarpp_related_cache (reference_ID,ID,score) SELECT , ID, (0+ (MATCH (post_content) AGAINST ('')) * 3+ (MATCH (post_title) AGAINST ('')) * 1+ COUNT( DISTINCT tagtax.term_taxonomy_id ) * 1+ COUNT( DISTINCT cattax.term_taxonomy_id ) * 1) as score from wp_posts left join wp_term_relationships as blockrel on (wp_posts.ID = blockrel.object_id) left join wp_term_taxonomy as blocktax using (term_taxonomy_id) left join wp_terms as blockterm on (blocktax.term_id = blockterm.term_id and blockterm.term_id in (242)) left JOIN wp_term_relationships AS thistag ON (thistag.object_id = ) left JOIN wp_term_relationships AS tagrel on (tagrel.term_taxonomy_id = thistag.term_taxonomy_id AND tagrel.object_id = wp_posts.ID) left JOIN wp_term_taxonomy AS tagtax ON ( tagrel.term_taxonomy_id = tagtax.term_taxonomy_id AND tagtax.taxonomy = 'post_tag') left JOIN wp_term_relationships AS thiscat ON (thiscat.object_id = ) left JOIN wp_term_relationships AS catrel on (catrel.term_taxonomy_id = thiscat.term_taxonomy_id AND catrel.object_id = wp_posts.ID) left JOIN wp_term_taxonomy AS cattax ON ( catrel.term_taxonomy_id = cattax.term_taxonomy_id AND cattax.taxonomy = 'category') where (post_status IN ( 'publish', 'static' ) and ID != '') and post_password ='' and post_type IN ('post') group by id having score >= 2.5 and count(blockterm.term_id) = 0 and COUNT( DISTINCT tagtax.term_taxonomy_id ) >= 1 order by score desc limit 10 on duplicate key update date = now()

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '0,0)' at line 1]
insert into wp_yarpp_related_cache (reference_ID,ID,score) values (,0,0)

Related posts:
Example post 1 (0)
Example post 2 (0)
Example post 3 (0)
Example post 4 (0)
Example post 5 (0)
Example post 6 (0)
Example post 7 (0)
Example post 8 (0)
Example post 9 (0)
Example post 10 (0)

[Plugin: Yet Another Related Posts Plugin] characters á,ú,í… are replaced

Sun, 26 Apr 2009 19:11:36 +0000

In the new version of this plugin (3.0), whenever I write an article with estrange characters (á,ú,í…) they are replaced with a “?”.

I use UTF-8.

Need a Related Pages plgin

Mon, 02 Feb 2009 09:36:45 +0000

I use YARPP which is great but seems only to list related posts but I need a plugin for related pages for our site. Any suggestions please?

Thanks
Stephen,

[Plugin: Yet Another Related Posts Plugin] Internal caching

Fri, 02 Jan 2009 00:04:59 +0000

“In the future I will be building a YARPP-internal cache system so that YARPP can calculate all the post-relations at one time and then re-use those results every time, rather than calculating them on the fly.”

This seems like a have to have feature! There is no reason that we need related posts in real time. I would much rather setup a job to run once per day or once per week for that matter and then again for any new post which is created.

[Plugin: Yet Another Related Posts Plugin] related_posts() vs. get_related_posts()

Mon, 29 Dec 2008 01:08:01 +0000

Hi,

I’m trying to combine this plug-in with the YAPB (Yet Another Photo Blog)-plugin, so that I can show related photos to each single photo.

To retrieve this I need a way to get the post-objects instead of the outputted xhtml – Something like get_related_posts(). Is this possible?

Cheers,
Asger

Posts related to tags

Wed, 10 Dec 2008 14:22:51 +0000

Hi there,

I’d like to display a list of posts that share the tags of the current post. Not as keywords but as list of Post tiles.

Also, I’d like to accompany the post titles with the data from a custom field.

Something like this in the body of the current post is what I’m aiming for:

1984
“Do you begin to see, then, what kind of world we are creating?”
Ghostbusters
“Well that’s just great. Either I have a monster in my kitchen or I’m completely crazy.”
Jaws
“We’re going to need a bigger boat.”

I’m drawing a blank on this at the moment so any pointers would be a big help.

Matt