pbdb - A key/value database inspired by Designing Data-Intensive Applications

pbdb

Description

pbdb is a key/value database inspired by chapter 3 of Designing Data-Intensive Applications by Martin Kleppmann.

The underlying storage format is very simple: a text file where each line contains a key-value pair, separated by a comma (roughly like a CSV file, ignoring escaping issues). Every call to db_set appends to the end of the file, so if you update a key several times, the old versions of the value are not overwritten — you need to look at the last occurrence of a key in a file to find the latest value [...] (Kleppmann 2017)

It also uses a hash index (like Kleppmann later suggests) to speed up reads.

Usage

pbdb is an experiment and not meant for production by any sense of the word. However, if you wish to run it here's how:

pbdb run --data DATABASE_FILE --port PORT

This will start the database and bind it to PORT (default: 1728 ). The database will survive restarts, but will need a moment to reindex its in-memory hash index. You can interact with the database using http.

$ curl localhost:1728/set/foo -d bar
$ curl localhost:1728/get/foo
bar$

There's no authentication , you have been warned.

Works Cited

Kleppmann, Martin. Designing Data-Intensive Applications (Kindle Locations 1934-1937). O'Reilly Media. Kindle Edition.