Riak is a distributed NoSQL database that is designed to provide high availability, scalability, and fault tolerance. It is an open-source software that can be used to store and retrieve large amounts of data in a distributed environment.
Riak uses a data model based on key-value pairs, where data is stored in a hash table, and each key maps to a value. The keys and values can be of any data type, and the values can be large binary objects such as images or video files.
Riak uses a distributed architecture, where data is automatically replicated across multiple nodes in a cluster. This allows for high availability, as the data can be accessed even if one or more nodes in the cluster fail. It also allows for scalability, as the cluster can be easily expanded by adding more nodes.
Riak also supports advanced features such as data indexing, secondary indexes, and map-reduce. This allows for efficient querying and analysis of large data sets.
Riak can be used for a variety of use cases such as gaming, e-commerce, social media, and IoT. It can also be used in conjunction with other data stores such as PostgreSQL, Redis, and Cassandra for a more comprehensive solution.
Must Riak run on multiple machines?
Riak is designed to run on multiple machines in a cluster to provide high availability, scalability, and fault tolerance. Each machine in the cluster runs a Riak node and is responsible for storing and managing a portion of the data. The data is automatically replicated across multiple nodes in the cluster, so that if one node fails, the data can still be accessed from another node.
In order to have high availability, it is recommended to have at least three nodes in a cluster, so that the data can be replicated across multiple nodes. The more nodes in the cluster, the more fault-tolerance and scalability the system has.
It's important to note that Riak nodes can run on separate machines, or on the same machine with different IP addresses, but it does require multiple machines to run in a cluster.
Which datatypes exist in Riak?
Riak is a key-value store, which means that it stores data in the form of key-value pairs. The keys and values can be of different data types, such as strings, integers, floats, lists, sets, and maps.
The keys in Riak are strings and the values can be strings, numbers, and binary data. Riak also supports complex data types such as lists, sets, and maps, which allow you to store multiple values under a single key.
Riak also supports data types for specific use cases, like the CRDT (Commutative Replicated Data Types) for distributed counters, sets, and maps and the TS (Time Series) to store time series data.
Additionally, Riak allows you to store large binary objects such as images or video files, and it also supports automatic data compression and decompression.
Riak also supports advanced features such as data indexing, secondary indexes, and map-reduce. This allows for efficient querying and analysis of large data sets.