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Key-Value Store software

LEADING OPEN SOURCE KEY-VALUE STORE SOFTWARE

OTHER OPEN SOURCE KEY-VALUE STORE SOFTWARE

Cassandra is a highly scalable, eventually consistent, distributed, structured key-value store. Cassandra brings together the distributed systems technologies from Dynamo and the data model from Google’s BigTable. Like Dynamo, Cassandra is eventually consistent. Like BigTable, Cassandra provides a ColumnFamily-based data model richer than typical key/value systems.

Voldemort is a distributed key-value storage system

– Data is automatically replicated over multiple servers.
– Data is automatically partitioned so each server contains only a subset of the total data
– Server failure is handled transparently
– Pluggable serialization is supported to allow rich keys and values including lists and tuples with named fields, as well as to integrate with common serialization frameworks like Protocol Buffers, Thrift, and Java Serialization
– Data items are versioned to maximize data integrity in failure scenarios without compromising availability of the system
– Each node is independent of other nodes with no central point of failure or coordination
– Good single node performance: you can expect 10-20k operations per second depending on the machines, the network, the disk system, and the data replication factor
– Support for pluggable data placement strategies to support things like distribution across data centers that are geographically far apart.

It is used at LinkedIn for certain high-scalability storage problems where simple functional partitioning is not sufficient. It is still a new system which has rough edges, bad error messages, and probably plenty of uncaught bugs.

Open source dynamo clone written in Erlang.

MemcacheDB is a distributed key-value storage system designed for persistent. It is NOT a cache solution, but a persistent storage engine for fast and reliable key-value based object storage and retrieval. It conforms to memcache protocol(not completed, see below), so any memcached client can have connectivity with it. MemcacheDB uses Berkeley DB as a storing backend, so lots of features including transaction and replication are supported.

Membrain is amassively multi-threaded implementation of memcached, optimized to exploit flash memory. Membrain delivers order-of-magnitude server consolidation, greatly simplifying your datacenter scale out for capacity and performance. Membrain also delivers persistence, for use as a highly-efficient NoSQL data store, and enterprise-grade synchronous replication and immediate failover.

LevelDB is a fast key-value storage library written at Google that provides an ordered mapping from string keys to string values.

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