Open Source Distributed Database
By admin on Mar 23, 2010 in database, Java, open source
The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo’s fully distributed design and Bigtable’s ColumnFamily-based data model.
Cassandra was open sourced by Facebook in 2008, and is now developed by Apache committers and contributors from many companies.
Cassandra is in use at Digg, Facebook, Twitter, Reddit, Rackspace, Cloudkick, Cisco, SimpleGeo, Ooyala, OpenX, and more companies that have large, active data sets. The largest production cluster has over 100 TB of data in over 150 machines.
Data is automatically replicated to multiple nodes for fault-tolerance. Replication across multiple data centers is supported. Failed nodes can be replaced with no downtime.
Every node in the cluster is identical. There are no network bottlenecks. There are no single points of failure.
Cassandra implements an eventually consistent model and includes sophisticated features such as Hinted Handoff and Read Repair to minimize inconsistency windows.
Allows efficient use for many applications beyond simple key/value.
Read and write throughput both increase linearly as new machines are added, with no downtime or interruption to applications.
Writes and reads offer a tunable ConsistencyLevel, all the way from "writes never fail" to "block for all replicas to be readable," with the quorum level in the middle.
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