Redis was created earlier this year, taking the idea of Memcached, and adding rich data structures like Lists and Sets making an even more compelling product. Redis also allows you to persist to disk every X minutes or after X number of key changes. There is a new feature called append only file which will stream write operations to a file and fsync this file every command processed or every second. RethinkDB uses the same concept to improve their database performance.

Redis will soon have the ability to store more data than the ram available in the system, a locking mechanism, and transaction system. With these in place, Redis will become an even more serious replacement for  the RDBMS.

2010 will be a great year. I can’t wait to see what new applications are powered by Redis.