# Experience with Rules-Based Programming for Distributed Concurrent Fault-Tolerant Code

<http://blog.acolyer.org/2016/01/19/dcft/>

- Host: [blog.acolyer.org](https://links.thingelstad.xyz/hosts/blog.acolyer.org/)
- Saved: January 20, 2016 (2016-01-20T11:11:01Z)
- Record: https://links.thingelstad.xyz/links/a9b2ef2681d9/
- JSON: https://links.thingelstad.xyz/links/a9b2ef2681d9.json

## From the page (probably an excerpt, not Jamie's words)

To demonstrate applicability outside of the RAMCloud system, the team also re-wrote the Hadoop Map-Reduce job scheduler (which uses a traditional event-based state machine approach) using rules. The original code has three state machines containing 34 states with 163 different transitions, about 2,250 lines of code in total. The rules-based re-implementation required 19 rules in 3 tasks with a total of 117 lines of code and comments.

## Facts

- Kind: [Page](https://links.thingelstad.xyz/kinds/page/)

## Same host

- [Moving Fast with Software Verification | the morning paper](https://links.thingelstad.xyz/links/6538f05da097/) (blog.acolyer.org, November 29, 2015)
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- [File systems unfit as distributed storage backends: lessons from ten years of Ceph evolution – the morning paper](https://links.thingelstad.xyz/links/5069b0efeec1/) (blog.acolyer.org, November 7, 2019)
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## Elsewhere

- Wayback Machine: https://web.archive.org/web/*/http://blog.acolyer.org/2016/01/19/dcft/