XF 2.1 cache_id_prefix and lifetime for cache in XF2, like it was in XF 1.5??

[sajal]

In XF2, do we have any provision to specify the cache_id_prefix and lifetime in the configuration file?

Also, if you could answer this: https://xenforo.com/community/threa...ns-for-caching-in-xf-2-1.176510/#post-1404518, I would appreciate it.

 

[Mike]

The prefix is roughly:

$config['cache']['namespace'] = 'unique_value';

Otherwise the caching config is quite distinct in XF2. It's discussed here: https://xenforo.com/xf2-docs/manual/cache/ Roughly anything outside that you can't change. For example, lifetime is defined by the context that uses it.

 

[sajal]

Thanks a lot @Mike for your reply. I've noticed that, there a "Guest page caching". Was there anything like this in XF 1.5.X?

As we've almost 10M records, would you recommend enabling this "Guest page" caching on live site?

 

[Mike]

No, that feature is new in 2.1. It can help reduce load from guest views, though it really only relates to repeated viewing of particular pages. So in that regard, it would tend to be most beneficial on busy sites, particularly if there's a particular "hot" area.

The main caveat is that you generally don't want to use the same cache instance as you use for the "core" XF stuff, including sessions, as page caching can trigger quite a bit of data to be inserted. If that pushes the other data out, you're likely to have worse behavior (such as people getting logged out). Here's an example where someone has setup 2 Memcached instances to separate the caching: https://xenforo.com/community/threads/memcached-for-guest-page-caching.176404/

 

[sajal]

Ah thanks @Mike for the insightful reply. That makes sense. Between, I am trying to implement "Guest page caching" with following, but doesn't seem to be working as expected:

$config['cache']['enabled'] = true;
$config['cache']['sessions'] = true;
$config['cache']['provider'] = 'Redis';
$config['cache']['config'] = [
    'host' => 'localhost',
    'port' => '6379'
];
$config['cache']['namespace'] = 'xf2_';

$config['pageCache']['enabled'] = true;
$config['pageCache']['lifetime'] = 300;
$config['cache']['context']['page']['provider'] = 'Redis';
$config['cache']['context']['page']['config'] = [
    'host' => 'localhost',
    'port' => '6379'
];

But, I can't see any "X-XF-Cache-Status: HIT" headers. Also, I insepcted cache keys in redis-cli, I don't see any key that has "page_" kind of prefix that should store the "whole guest page". Your thoughts?

 

[Mike]

If you see the header, it's working -- that's only returned when it's from the cache.

The actual cache keys used are more complex as there are changes to them from the underlying caching library we use.

 

[sajal]

Yeah @Mike, true, but the issue is that I can not see any header

 

[Mike]

Sorry, I misread.

I've tried exactly the config.php code you showed just modified to point at a local filesystem cache and the caching worked immediately as expected.

$config['cache']['context']['page']['provider'] = 'filesystem';
$config['cache']['context']['page']['config'] = [
    'directory' => \XF::getRootDirectory() . '/internal_data/pagecache'
];

(Plus the additional code you pasted. That's really just an example of how I modified it.)

I'm not clear on what would cause it not to be triggered short of the config.php changes not being applied. Your forum user also doesn't appear to be connected to the forum you're referring to, so I can't double check what I'm seeing.

 

[sajal]

@Mike Could it be due to the Redis as a CacheProvider?