Serious Redis Object Cache Bug
-
Hi,
An update struck one of my servers for some reason killing the Redis instance, or at least, it’s a nasty bug where some redis instances simply do no longer work that are within CageFS it seems. We’re actively trying to resolve this with Cloudlinux. It seems a update from RHEL caused issues with the above.
But – this caused approx 15+ websites to crash – due to non existing Redis service not being available, and the websites that where running litespeed Caching and using object cache still proceeded to work (just without redis). It means that for whatever reason Redis is not available, the site simply won’t start using this plugin.
I would suggest a fail-safe fallback, because i had to plunge into hundreds of sites to learn i had approx 15 running with above plugin that failed to start.
-
I m agree.
Why do you not include this code below to your start file “object-cache.php” ?
That will be simple and secure.
Thanks.
if (!defined('WP_REDIS_DISABLED')) {
if (!class_exists('Redis')) {
define('WP_REDIS_DISABLED', true); // PHPRedis extension not installed
} else {
try {
$redis = new Redis();
$redis->connect('127.0.0.1', 6379, 1); // 1s timeout
if (!$redis->ping()) {
define('WP_REDIS_DISABLED', true); // Redis server not responding
}
$redis->close();
} catch (Exception $e) {
define('WP_REDIS_DISABLED', true); // Redis connection failed
}
}
}De-install and used Object Cache that came through Litespeed.
The good news is that whenever Redis is no longer available, the site won’t stall, crash, it will still continue to operate. It caches whatever you insert into it. No need for a fancy plugin for virtually the same.
The bad news? I can’t think of one really. It all comes in one package through Litespeed.
I figured i get identical speed results for the smaller websites i’m running by using a combination of Memcached and Opcache. Object cache in general should only be used when that database is large in the millions of rows.
The topic ‘Serious Redis Object Cache Bug’ is closed to new replies.
