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In the middle of this request, the mcrouter update is deployed to that server. We reasoned that this probably was due to changing patterns in usage of memcached. Visualization is a bit wonky, but we created dashboards for point in time representation of the data so we can at least eyeball if some caches have major differences in slab allocation and in general see what size keys each pool tends to have. In practice, this is so unlikely that it managed to happen only once. This is one of our biggest pain points and is a single point of failure. For instance, maybe you want to check what the real-world miss and eviction rate will be with a bigger pool of smaller instances. Though Reddit still has a relatively small engineering team, we do manage to make a lot of changes, and cache patterns can certainly change over the course of months. Overall, caching has been a great way to help improve the response time of the site and is a crucial part of letting us serve Reddit at scale. Overall, mcrouter has made the management of our cache servers a lot easier and has given us a lot of flexibility. Fallback can always happen to the backend store if need be, but in practice this rarely happens. Warm them up slowly with WarmUpRoute. The connection pooling functionality alone gives us a good amount of benefit.
With our new pieces of monitoring, we can have much better insight into what is going on with our caches for tuning and sizing. After investigating the number of duplicate trophies by user and finding a couple hundred duplicate trophies, we noticed there was actually an account or two with 3 trophies! One we used heavily when migrating operating system and memcached versions was shadow writing. Overall, caching has been a great way to help improve the response time of the site and is a crucial part of letting us serve Reddit at scale. Migration or maintenance of this box means shutting down the entire site. Use FailoverRoute to define a failover pool as a fallback for your regular pools. Want to discuss this blog post? One of our major goals over the last couple of years has been to move our caching infrastructure behind mcrouter. We also use memcached for locking. Custom Monitoring As alluded to earlier, memcached can sometimes be a bit of a black box. In practice, this is so unlikely that it managed to happen only once. Cache requests for the trophy list for a user would first go to the new caches, a miss would occur, and the data would be retrieved from the old caches and added to the new ones. With no expiration time explicitly indicated to mcrouter, this causes the item to be put into the new cache with no TTL at all! What we needed was simple: Instead, we update the backend store in Cassandra as well as the cache. These use functionality provided by memcached in novel ways for rate limiting and locking. The code behind this trickery can be seen here. Visualization of slab allocation in Tessera for a single cache instance The second lack of insight we had was related to why slab allocation would change in the first place. Visualization is a bit wonky, but we created dashboards for point in time representation of the data so we can at least eyeball if some caches have major differences in slab allocation and in general see what size keys each pool tends to have. In an ideal world, updates to the list of caches when warming would happen instantaneously to all servers responsible for handling the updating of trophies. The connection pooling functionality alone gives us a good amount of benefit. Want to route keys to specific pools based on their functionality? Multiply that by the sheer number of servers it takes to run Reddit, and the number of connections adds up. If the lock is acquired, the functionality is then performed under the lock, and the key removed. Overall, mcrouter has made the management of our cache servers a lot easier and has given us a lot of flexibility. They look like this:
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