Voldemort is a

distributed data store A distributed data store is a computer network where information is stored on more than one node, often in a replicated fashion. It is usually specifically used to refer to either a distributed database where users store information on a ''numb ...

that was designed as a key-value store used by

LinkedIn LinkedIn () is an American business and employment-oriented Social networking service, social network. It was launched on May 5, 2003 by Reid Hoffman and Eric Ly. Since December 2016, LinkedIn has been a wholly owned subsidiary of Microsoft. ...

for highly-scalable storage. It is named after the fictional ''

Harry Potter ''Harry Potter'' is a series of seven Fantasy literature, fantasy novels written by British author J. K. Rowling. The novels chronicle the lives of a young Magician (fantasy), wizard, Harry Potter (character), Harry Potter, and his friends ...

'' villain

Lord Voldemort Lord Voldemort ( , in the films) is a fictional character and the main antagonist in the ''Harry Potter'' series of novels by J. K. Rowling. He first appears in ''Harry Potter and the Philosopher's Stone'' (1997) and returns either in pers ...

Overview

Voldemort does not try to satisfy arbitrary relations and the

ACID An acid is a molecule or ion capable of either donating a proton (i.e. Hydron, hydrogen cation, H+), known as a Brønsted–Lowry acid–base theory, Brønsted–Lowry acid, or forming a covalent bond with an electron pair, known as a Lewis ...

properties, but rather is a big, distributed, persistent hash table. A 2012 study comparing systems for storing

application performance management In the fields of information technology and systems management, application performance management (APM) is the monitoring and management of the performance and availability of software applications. APM strives to detect and diagnose complex appli ...

data reported that Voldemort,

Apache Cassandra Apache Cassandra is a free and open-source software, free and open-source database management system designed to handle large volumes of data across multiple Commodity computing, commodity servers. The system prioritizes availability and scalab ...

, and HBase all offered linear scalability in most cases, with Voldemort having the lowest latency and Cassandra having the highest throughput. In the parlance of Eric Brewer's

CAP theorem In database theory, the CAP theorem, also named Brewer's theorem after computer scientist Eric Brewer (scientist), Eric Brewer, states that any distributed data store can provide at most Inconsistent triad, two of the following three guarantees: ; ...

, Voldemort is an AP type system. Voldemort's creator and primary corporate contributor, LinkedIn, has migrated all of their systems off of Voldemort as of approximately August 2018, with no replacement sponsor . In 2022, LinkedIn announced Project Venice as an open source replacement

Properties

Voldemort uses in-memory caching to eliminate a separate caching tier. It has a storage layer that is possible to emulate. Voldemort reads and writes scale horizontally. The API decides data replication and placement and accommodates a wide range of application-specific strategies.Serving Large-scale Batch Computed Data with Project Voldemort
/ref> The Voldemort distributed data store supports pluggable placement strategies for distribution across data centers. Data is automatically replicated across servers. Data is partitioned meaning a single server contains only a portion of the total data. Each data node is independent to avoid central point of failure. Pluggable serialization allows rich keys and values including lists and tuples with named fields, as well as the integration with common serialisation frameworks such as

Avro Avro (an initialism of the founder's name) was a British aircraft manufacturer. Its designs include the Avro 504, used as a trainer in the First World War, the Avro Lancaster, one of the pre-eminent bombers of the Second World War, and the d ...

, Java Serialization,

Protocol Buffers Protocol Buffers (Protobuf) is a free and open-source cross-platform data format used to serialize structured data. It is useful in developing programs that communicate with each other over a network or for storing data. The method involves an ...

, and Thrift. Server failures are handled transparently. Data items are versioned, which maximizes data integrity.

References

External links

Project Voldemort - A distributed database

Project Voldemort Real Time Discussions
{{Microsoft FOSS Distributed data stores LinkedIn software NoSQL Microsoft free software Software using the Apache license 2009 software

Overview

Properties

See also

References

External links