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dqlite

dqlite is a C library that implements an embeddable and replicated SQL databaseengine with high-availability and automatic failover.

The acronym "dqlite" stands for "distributed SQLite", meaning that dqlite extendsSQLite with a network protocol that can connect togethervarious instances of your application and have them act as a highly-availablecluster, with no dependency on external databases.

Design highlights

• Asynchronous single-threaded implementation using libuvas event loop.
• Custom wire protocol optimized for SQLite primitives and data types.
• Data replication based on the Raft algorithm and itsefficient C-raft implementation.

License

The dqlite library is released under a slightly modified version of LGPLv3, thatincludes a copyright exception allowing users to statically link the library codein their project and release the final work under their own terms. See the fulllicense text.

Try it

The simplest way to see dqlite in action is to use the demo program that comeswith the Go dqlite bindings. Please see the relevantdocumentation in that project.

Media

A talk about dqlite was given at FOSDEM 2020, you can watch ithere.

Wire protocol

If you wish to write a client, please refer to the wire protocoldocumentation.

Install

If you are on a Debian-based system, you can get the latest development release fromdqlite's dev PPA:

sudo add-apt-repository ppa:dqlite/devsudo apt-get updatesudo apt-get install libdqlite-dev

Build

To build libdqlite from source you'll need:

• A reasonably recent version of libuv (v1.8.0 or beyond).
• A reasonably recent version of sqlite3-dev
• A build of the C-raft Raft library.

Your distribution should already provide you with a pre-built libuv sharedlibrary and libsqlite3-dev.

To build the raft library:

git clone https://github.com/canonical/raft.gitcd raftautoreconf -i./configuremakesudo make installcd ..

Once all the required libraries are installed, in order to build the dqliteshared library itself, you can run:

autoreconf -i./configuremakesudo make install

Usage Notes

Detailed tracing will be enabled when the environment variable LIBDQLITE_TRACE is set before startup.