A cache driver for Laravel that allows you to write to multiple memcached clusters simmultaneously.
This allows for zero-downtime migrations to new memcached clusters with no cache data lost. In the land of PHP, this is helpful for applications that utilize memcached as their session stores. Migrating cache clusters, or adding nodes to an existing cluster, causes cache keys to be redistributed. This causes some percentage of existing session keys to be "lost" as they're now rotated to a different server (that is to say, their expected location is different -- the data itself doesn't actually move).
By writing data to multiple cluster configurations, you can season the "new" cluster with the cache data for your active sessions and caches, and prevent session termination or cold-cache re-build on a new cluster.
This package adds an additional driver to the cache manager in Laravel. To use, add jrub\LaravelMemcachedProxyDriver\MemcachedProxyServiceProvider::class to your providers array in config/app.php. Then, add your cluster configuration(s) to config/cache.php using the memcached-proxy driver.
Here is an example configuration:
Keep in mind, only one cluster can be used to READ data, so that cluster will have a mode of rw while all the other clusters will have a mode of w only.
config/cache.php
<?php
return [
/*
Other Laravel Configurations
*/
'memcached-cluster' => [
'driver' => 'memcached-proxy',
'clusters' => [
// Cluster A
[
'mode' => 'rw',
'servers' => [
['host' => 'server-a.cluster-1.example.com', 'port' => 11211, 'weight' => 100],
['host' => 'server-b.cluster-1.example.com', 'port' => 11211, 'weight' => 100],
]
],
// Cluster B
[
'mode' => 'w', // Write only -- can't read from 2 clusters
'servers' => [
['host' => 'server-a.cluster-2.example.com', 'port' => 11211, 'weight' => 100],
['host' => 'server-b.cluster-2.example.com', 'port' => 11211, 'weight' => 100],
]
],
]
],
];