![]() RDB is very good for disaster recovery, being a single compact file that can be transferred to far data centers, or onto Amazon S3 (possibly encrypted).This allows you to easily restore different versions of the data set in case of disasters. For instance you may want to archive your RDB files every hour for the latest 24 hours, and to save an RDB snapshot every day for 30 days. RDB is a very compact single-file point-in-time representation of your Redis data.To learn more about how to evaluate your Redis persistence strategy, read on. If you'd rather not think about the tradeoffs between these different persistence strategies, you may want to consider Redis Enterprise's persistence options, which can be pre-configured using a UI. RDB + AOF: You can also combine both AOF and RDB in the same instance.No persistence: You can disable persistence completely.Commands are logged using the same format as the Redis protocol itself. These operations can then be replayed again at server startup, reconstructing the original dataset. AOF (Append Only File): AOF persistence logs every write operation received by the server.RDB (Redis Database): RDB persistence performs point-in-time snapshots of your dataset at specified intervals.Redis provides a range of persistence options. Luckily, NetFlix has just release a ton of manage tools just for this.Persistence refers to the writing of data to durable storage, such as a solid-state disk (SSD). The real cost is in setup and manage of your distributed Cassandra instance. Plus they have really slick integration with EC2.įor really serious levels of traffic, Pintrest once stated they spend $15 to $50/hour depending on server load, auto-scaling to meet traffic demands, see for details I highly recommend using TurnKey Linux to manage & provision your R&D farm, as their tools will allow you to migrate instances from your desktop to pretty much any virtualized hosting platform in a few minutes (and vice versa). You could easily run a substantial production cloud on EC2 for less than $1000/month and you can do R&D clouds for less than $100/month (I spend about $52 last month for an 10 machine test cluster). That said, that's a maintenance headache you want to avoid, and Cassandra on EC2 is far easier to deal with. Unlike what DavidB thinks, it does not cost millions - even if you were to run dedicated hosted hardware, you'd easily be under a couple thousand/month (BTDT, one of my clients is running a 8 node cluster for about $800/month). Note, I know this is an old question, I just want to counter balance some misconceptions about cost as I'm doing this right now as a test. You'll get more positive feedback on the Cassandra mailing list and on the IRC channel.įinally, this is from 2009, and written by folks at Facebook, which should go some way to help answer more of the fundamental questions you have: Cassandra - A Decentralized Structured Storage System. its files are broken down into blocks (whose sizes are capped), where each block (see FileBlock) is stored as the value of a column in the corresponding row. files of around 64Mb and smaller can be easily stored in the database without splitting them into smaller chunks. When retrieving, pull each column, reassemble the file and voila.Ĭassandra FAQ: large file and blog storage The principal behind this is to take a file, break it into a set of chunks and store those chunks as columns in a row. last touched 3 months ago and indicates compatibility with the 1.0.5 branch of Cassandra favoritas37/cassandra-fs another fork.2 years ago, that was version 0.6.x maybe? A lot has changed & improved in 24 months. Apache Cassandra is now at version 1.0.x, with 1.1.x on the way. Now, this was last developed 2 years ago, so I'd be a bit cautious on it working the first time, out of the box. zjffdu/cassandra-fs is the first solution i'd look into.As mentioned, there are caveats, however, the possibilities do exist, and a lot of people and companies are successfully storing files in Apache Cassandra. There's nothing wrong with the approach you're taking.
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