Over a million developers have joined DZone.

Redis as Memcached Replacement?

· Database Zone

Build fast, scale big with MongoDB Atlas, a hosted service for the leading NoSQL database. Try it now! Brought to you in partnership with MongoDB.

I found Redis to be a very interesting option to Memcached for use as caching layer:
  • Pretty much set/get operations on key/value, just like memcached, but with rich data structures, like Lists, Sets, Sorted Sets, Hashes, Blocking Queues. And rich commands to use all of them. That avoids serializing a bunch of data into Memcached values.
  • Durability options: Redis can be used just in memory, like memcached, or can be tuned to be durable (flushing data every so often is an option, or appending data to a log file that can be replayed if the node restarts, among others).
  • Master-slave: it can be configured as master slave, being the slaves your "read replicas".
  • Cluster: just like Memcached, it can be sharded using consistent hashing, but that's taking care of on the client side - which can a problem if used against cloud instances that are more likely to fail (so one needs to be prepared for updating the instance list on the client in case of failures).
  • Security: pretty much non-existent, or at least not built in, like Memcached. You need to resort to other security mechanisms (to be honest, Memcached had some SASL support, but I don't know the current state of that).
  • Not to mention the API, which "[..] is not simply easy to use, but a joy."
  • LUA support on the server side
  • Good client library support, as well. One good example is the library for a Bloom Filter on top of Redis.
  • Publish/Subscribe support: very cool publish/subscribe support on specific channels, pattern matching for both channel and message subscription, etc.
So the question that remains is why Memcached seems to be that much more popular?
  • LRU: one of the questions I've seen is related to the lack of LRU support, but this has been added to Redis
  • Performance: I did not find more recent numbers, but some numbers from 2010 show Redis being outperformed by Memcached. That could be a good reason not to use it.

I wonder if Redis performance has improved lately and if any other reason not to use Redis comes up - please comment if you know other reasons to avoid Redis.

 

 

Now it's easier than ever to get started with MongoDB, the database that allows startups and enterprises alike to rapidly build planet-scale apps. Introducing MongoDB Atlas, the official hosted service for the database on AWS. Try it now! Brought to you in partnership with MongoDB.

Topics:

Published at DZone with permission of Rodrigo De Castro, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

The best of DZone straight to your inbox.

SEE AN EXAMPLE
Please provide a valid email address.

Thanks for subscribing!

Awesome! Check your inbox to verify your email so you can start receiving the latest in tech news and resources.
Subscribe

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}