Memcached is an in memory cache with one major feature be a transient cache. Memcached has a very simple design. It was originally designed to help with database load by storing the query result in memory to avoid further querying the database. By default it has no authentication, a simple text protocols, servers don’t talk to each other. This video discuss the architecture of the cache, design choices and have some critics of the design choices. I go through a demo at the end using docker, telnet and nodes. Enjoy

0:00 Intro

4:40 What is Memcached?

7:45 Memory management

16:00 LRU

25:17 Threading and Connections

30:40 Read Example

34:30 Write Example

36:17 Write and Read collisions

39:40 Locking

40:30 Distributed Cache

43:30 Memcached with Docker/Telnet/NodeJS

45:00 Spin up a Memcached Docker container and telnet

52:17 Memcached and NodeJS

56:15 Four Memached Servers with NodeJS

01:01:00 Summary

Resources

https://www.cloudflare.com/learning/ddos/memcached-ddos-attack/

https://holmeshe.me/understanding-memcached-source-code-IV/

https://github.com/memcached/memcached/blob/master/doc/protocol.txt

https://docs.oracle.com/cd/E17952_01/mysql-5.6-en/ha-memcached-using-threads.html

https://holmeshe.me/understanding-memcached-source-code-I/

https://docs.oracle.com/cd/E17952_01/mysql-5.6-en/ha-memcached-using-memory.html

https://support-acquia.force.com/s/article/360005256114-Memcached-in-detail

https://www.alibabacloud.com/blog/redis-vs-memcached-in-memory-data-storage-systems_592091

https://www.usenix.org/system/files/conference/nsdi13/nsdi13-final197.pdf

https://memcached.org/blog/persistent-memory-2/

https://memcached.org/blog/modern-lru/ Buy me a coffee https://www.buymeacoffee.com/hnasr