Riak is a distributed database designed to deliver maximum data availability by distributing data across multiple servers. As long as your client can reach one Riak server, it should be able to write data. In most failure scenarios, the data you want to read should be available, although it may not be the most up-to-date version of that data.
Riak is a tool in the Databases category of a tech stack.
Riak is an open source tool with 3.2K Github Stars and 523 Github Forks. Here’s a link to Riak's open source repository on Github
15 companies use Riak including SendGrid, Sentry, and OpenX.
Here’s a list of reasons why companies and developers use Riak.