citus: A C repository from thisiswei

What is Citus?

Open-source PostgreSQL extension (not a fork)
Scalable across multiple hosts through sharding and replication
Distributed engine for query parallelization
Highly available in the face of host failures

Citus horizontally scales PostgreSQL across commodity servers using sharding and replication. Its query engine parallelizes incoming SQL queries across these servers to enable real-time responses on large datasets.

Citus extends the underlying database rather than forking it, which gives developers and enterprises the power and familiarity of a traditional relational database. As an extension, Citus supports new PostgreSQL releases, allowing users to benefit from new features while maintaining compatibility with existing PostgreSQL tools. Note that Citus supports many (but not all) SQL commands; see the FAQ for more details.

Common Use-Cases:

Powering real-time analytic dashboards
Exploratory queries on events as they happen
Large dataset archival and reporting
Session analytics (funnels, segmentation, and cohorts)

To learn more, visit citusdata.com.

Quickstart

Local Citus Cluster

Install docker-compose: Mac | Linux
(Mac only) connect to Docker VM
```
eval $(docker-machine env default)
```

Pull and start the docker images

wget https://raw.githubusercontent.com/citusdata/docker/master/docker-compose.yml
docker-compose -p citus up -d

Connect to the master database

docker exec -it citus_master psql -U postgres -d postgres

Follow the first tutorial instructions
To shut the cluster down, run
```
docker-compose -p citus down
```

Learn More

The project documentation and tutorials are good places to start. We’re responsive on Github, so you can use the issue tracker to check for or submit bug reports and feature requests. For more immediate help or general discussion we’re on IRC at #citus on Freenode and @citusdata on Twitter.

We also offer training and dedicated support options. More information is available on our support page.

Contributing

Citus is built on and of open source. We welcome your contributions, and have added a helpwanted label to issues which are accessible to new contributors. The CONTRIBUTING.md file explains how to get started developing the Citus extension itself and our code quality guidelines.

Who is Using Citus?

Citus is deployed in production by many customers, ranging from technology start-ups to large enterprises. Here are some examples: