*Detailed background on rqlite can be found on [these blog posts](http://www.philipotoole.com/tag/rqlite/). Note that master represents 2.0 development (which is still in progress), with a new API and Raft consensus module. If you want to work with 1.0 rqlite, you can find it [here](https://github.com/otoolep/rqlite/releases/tag/v1.0).*
*Detailed background on rqlite can be found on [these blog posts](http://www.philipotoole.com/tag/rqlite/)*.
*rqlite* is a distributed system that provides a replicated SQLite database. rqlite is written in [Go](http://golang.org/) and uses [Raft](http://raftconsensus.github.io/) to achieve consensus across all the instances of the SQLite databases. rqlite ensures that every change made to the database is made to a quorum of SQLite files, or none at all.
The use of the URL param `pretty` is optional, and results in pretty-printed JSON responses.
### expvar
### expvar support
rqlite also exports [expvar](http://godoc.org/pkg/expvar/) information. Both standard and custom information is exposed. This data can be retrieved like so:
```bash
@ -306,7 +306,7 @@ The node can then be restored by loading this database file via `sqlite3` and ex
By default a backup can only be retrieved from the leader, though this check can be disabled by adding `noleader` to the URL as a query param.
## Log Compaction
rqlite does perform log compaction. After a fixed number of changes rqlite snapshots the SQLite database, and truncates the Raft log.
rqlite automatically performs log compaction. After a fixed number of changes rqlite snapshots the SQLite database, and truncates the Raft log. This is a technical feature of the Raft consensus system, and most users of rqlite need not be concerned with this.
## Limitations
* SQLite commands such as `.schema` are not handled.
Philip O Toole
9 years ago