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Created page with "A '''distributed data store''' is a computer network where information is stored on more than one node, often in a Replication (computing)|replicat..."

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A '''distributed data store''' is a [[computer network]] where information is stored on more than one [[Node (networking)|node]], often in a [[Replication (computing)|replicated]] fashion. It is usually specifically used to refer to either a [[distributed database]] where users store information on a ''number of nodes'', or a [[computer network]] in which users store information on a ''number of peer network nodes''.

==Distributed databases==
[[Distributed database]]s are usually [[non-relational database]]s that make a quick access to data over a large number of nodes possible. Some distributed databases expose rich query abilities while others are limited to a [[key-value store]] semantics. Examples of limited distributed databases are [[Google]]'s [[BigTable]], which is much more than a [[distributed file system]] or a [[peer-to-peer network]], [[Amazon.com|Amazon]]'s [[Dynamo (storage system)|Dynamo]]
and [[Azure Services Platform|Windows Azure Storage]].

As the ability of arbitrary querying is not as important as the [[availability]], designers of distributed data stores have increased the latter at an expense of consistency. But the high-speed read/write access results in reduced consistency, as it is not possible to have both [[Consistency (database systems)|consistency]], availability, and partition tolerance of the network, as it has been proven by the [[CAP theorem]].

==Peer network node data stores==
In peer network data stores, the user can usually reciprocate and allow other users to use their computer as a storage node as well. Information may or may not be accessible to other users depending on the design of the network.

Most [[peer-to-peer]] networks do not have distributed data stores in that the user's data is only available when their node is on the network. However, this distinction is somewhat blurred in a system such as [[BitTorrent (protocol)|BitTorrent]], where it is possible for the originating node to go offline but the content to continue to be served. Still, this is only the case for individual files requested by the redistributors, as contrasted with a network such as [[Freenet]] where all computers are made available to serve all files.

Distributed data stores typically use an [[error detection and correction]] technique.
Some distributed data stores (such as [[Parchive]] over NNTP) use [[forward error correction]] techniques to recover the original file when parts of that file are damaged or unavailable.
Others try again to download that file from a different mirror.

==Examples==

===Distributed non-relational databases===
* [[Aerospike database|Aerospike]]
* [[Apache Cassandra]], former data store of [[Facebook]]
* [[Apache Ignite]]
* [[BigTable]], the data store of [[Google]]
* [[CrateIO]]
* [[Druid (open-source data store)]], used by [[Netflix]], [[Yahoo]] and others
* [[Dynamo (storage system)|Dynamo]] of [[Amazon.com|Amazon]]
* [[Hazelcast]]
* [[HBase]], current data store of Facebook's Messaging Platform
* [[Couchbase]], data store used by [[LinkedIn]], [[Paypal]], [[Ebay]] and others.
* [[MongoDB]]
* [[Riak]]
* [[Hypertable]], from [[Baidu]]
* [[Voldemort (distributed data store)|Voldemort]], data store used by [[LinkedIn]]

===Peer network node data stores===
* [[BitTorrent (protocol)|BitTorrent]]
* [[Blockchain (database)]]
* [[Chord project]]
* [[GNUnet]]
* [[Freenet]]
* Unity, of the software [[Perfect Dark (P2P)|Perfect Dark]]
* [[Mnet (Computer program)|Mnet]]
* [[Network News Transfer Protocol|NNTP]] (the distributed data storage protocol used for [[Usenet]] news)
* [[Storage@home]]
* [[Tahoe-LAFS]]
* [[InterPlanetary File System|IPFS]]
* [[ZeroNet]]
* [[SiaCoin|Sia]]
* [[STORJ|Storj]]
* [[MaidSafe]]

==See also==

* [[Cooperative storage cloud]]
* [[Data store]]
* [[Distributed file system]]
* [[Keyspace (distributed data store)|Keyspace]], the DDS [[Schema (database)|schema]]
* [[Peer-to-peer]]
* [[Distributed hash table]]
* [[Distributed cache]]
* [[Cyber Resilience]]

==Source==

[http://wikipedia.org/ http://wikipedia.org/]
[[Category:Data storage]]
[[Category:Database]]

Distributed data store - Revision history

Admin: Created page with "A '''distributed data store''' is a computer network where information is stored on more than one node, often in a Replication (computing)|replicat..."