Redis is an advanced key-value repository. Experience of use in loaded projects

We have been successfully using Redis in our highload projects for half a year. During this time, many successful Redis solutions have been developed for the tasks faced by the developers of most large projects. I would like to share examples of these decisions on the upcoming DEVCONF , in order to show in practice the possibilities, advantages and weaknesses of Redis.

Redis - a brief overview (or Redis is not just a key-value database):

• Redis is very fast
• Data types: String, List, Set, Sorted set, Hash
• Atomicity of operations
• Data Preservation: Snapshot, Append-Only File (binlog)
• Transactions
• Virtual memory
• Master / Slave replication
• Publish / Subscribe (message queues)
• Pipeline
• Redis tools
• Clients (PHP, Ruby, Python, Erlang, Perl, Tcl, Java, Lua, C #, Javascript / Node.js, ...)

Comparison of performance and features with other repositories:

• MySQL (InnoDB)
• Memcached
• Cassandra
• Tokyo Cabinet
• MongoDb

Learn more about features with practical examples:

• Key space
  Separate key storage on a single Redis server. Base for testing and development environment.
• String-value keys
  Unique identifiers, counters, serialized objects.
• Key lifetime
  Caching, session storage.
• Lists - ordered list of values
  Keeping a list of keys of serialized objects, simple queues.
• Sets - an unordered set of unique values
  Tags, friends, pending deletes, online users list, “visited page”.
• Sorted Set - a set of unique values ​​ordered by weight
  Voices and user rating, autocomplex.
• Hashes
  A new more suitable way to store and work with serialized objects.
• Transactions
  Integrity and atomicity of the execution of a set of commands.
• Publish / Subscribe
  Queue, chat.
• Pipeline
  Quick execution of a set of commands.
• Fault tolerance and data integrity
  Uninterrupted operation and guaranteed data integrity. Master / Slave replication.
• Key Blur on Redis Servers
  Rediska: crc32, consistent hashing, cloud.
• Service and monitoring
  Redis Tools. Commands INFO and MONITOR.

In conclusion, I will talk about upcoming innovations, as well as where, how and why you should not use Redis.

If you are not indifferent, vote for the report .